I can think of a few reasons for mine already 
Yeah, having others look at and revise your work with fresh eyes is really crucial. It's becoming my favourite part of the process because it needs least effort from my part haha
Here are some visual examples...
In this picture, the thicker parts of the lineart show shadow and weight of the fabric, contrasting to the thinner lines of the arms. In action scenes, you can maybe thicken the parts of the lineart where you want to draw attention to.
the artist is rvsa3 (nsfw warning). I think they have a lot of great examples of dynamic linework.
This example is for showing more examples of adding shadow with your lines/inks and really adding more life to them. The use of black in the image puts more emphasis on the figure, lets the viewer give more focus to the details that are there and adds a dramatic effect. This is something you can possibly utilise in a critical/climatic moment.
Artist is grassdlc3 (also nsfw warning
)
If you want an example with cleaner digital lines, chootalks4 has quite a lot of them too. They balance shadow with neat, thin lines.
Take my advice with a grain of salt though, I could be just biased by personal taste. I've seen a lot of webcomics with very clean and 'monotonous' lineart that works well, even if it's not my thing.
I can really relate to the story problem, we comic creators get so excited over our stories and just want to get everything out at once. You can either trim it or give it more room to grow while giving the story some breaks. Consider getting beta readers as well and ask them what they think is going on or what the story is so far (in the storyboarding/thumbnail phase), that would help narrow down the more problematic parts.
Honestly, I would describe your comic as good though, especially if it's your first one.
@morganicfoods I like your clothing designs but they are a bit stiff on the people. The beginning of the story is average, as there isn't a super strong hook to it, but there's nothing wrong with it either. I'm not sure why some panels have shading while other ones don't. If you break consistency, it's better if the reason for that is obvious to your reader. I also think you can think about your gutters more, as reading the comic without them makes it feel a bit cramped.
@MossyRabbit you put in a lot of effort into the art, I wish you put the same about of care into your speech bubbles. Also, your backgrounds were great in the first episode, so I felt that they felt short in the episodes that came after. I do get it thou, it's a lot of work. Overall, good job!
@Ariaz I'm bit confused about what happened in the first episode until ep. sweet, but other than that, it's easy to follow. Really enjoyed that hang on poster lol. Backgrounds could be improved. Think about the space around characters.
@kellychen Thank you so much for the feedback! I really appreciate it! 
Here's my comic, Far-Star Summer School. It's just starting out, and I'm curious to know how the pacing feels to new readers? There are kind of a lot of characters being introduced one after the other, and I'm not sure if they get enough screen time to make an impression. I also don't want it to feel like too slow of a start.
Any additional critique related to the art, writing, historical accuracy, anything really, would be SUPER appreciated. It's my first time taking a webcomic project seriously, and I'd like as much input as I can get. I'll try to read some of the other comics here and come back to offer my own feedback, but I'm always so worried that I'll hurt someone's feelings. Which is silly because that's why we're all in this thread.
It's been a long time since the initial release of my main webcomic, so I'd like some feedback on how I can improve the first impressions, as I'm thinking of redrawing/retouching the first chapter to show the level of art it's currently at right now. Story related critique is highly appreciated too.
@Pebphiz Yo I just read through the first few pages of your webcomic, and pacing wise it's actually pretty good--it's going slow enough that I can digest the different characters being introduced, but it's fast enough that things are moving at a brisk pace. It's very comfy.
I would say the most pressing issue with your webcomic would be the panelling.
Your panels are really small and the layouts are very cramped--this leaks into the sizing of your lettering and speech bubbles as well, which make things really hard to read (especially for phone readers).
Consider making your panels larger and more spaced out--this makes it a lot easier for readers to follow what's going on, and it'll be a little gentler on readers' eyes.
I was about to say to be more careful with the placement and flow of your speech bubbles, however after taking a closer look, I realised you actually know what you're doing, so good on you for that. Just be careful not to go too wild with it, as it may confuse readers.
Other than that, I wanted to say that the draftsmanship and polish of your art improved a lot in your later episodes, so I was really happy to see that.
Good stuff mayn, and best of luck for this project--it looks very promising!
I would love to see what I can do to improve , thank you for the opportunity , I know my first ones aren't the best and aren't even in color so I was thinking about remaking them
Always a good idea to get feedback, although might be risky asking it from strangers...
I like your use of colours and negative space, and your characters have a seamless flowing feel to them. Rather unorthodox style of art.
However, sometimes putting the speech bubbles in unorthodox places and having the text and bubbles a similar shade to the characters makes it a little hard to identify and follow. It kind of blends together.
And as with unorthodox styles and techniques, it does make it tougher for the mainstream crowd to accept.
Also the graininess in your recent episodes doesn't feel aesthetically pleasing to me - just my personal taste.
That said, your art certainly has a very unique feel and look to it! Keep up the amazing work!
16 days later
Why wouldn't you? Perhaps it is incorrectly classified? (super hero or slice of life, or fantastic?)
3 months later
Welp, i already know the history is kinda too "contextless" even being a Mystery, but...
Webtoons:
Tapas:
9 days later
I'm going to come back later and give feedback to someone.
I have a gag comic that apparently has dark humor, light humor, and puns. I redrew my first and second comics, so if they look different that's why. I'm pretty sure people don't care though because it's still the same characters.
I personally like the simple art and humor for a gag comic.
However,
Many of the jokes are told-not-shown. I think many of them, especially the puns, could work with at least one other picture. The "Party" one is an example-- you could maybe put a couple people with party hats and a table with some pizza and a jukebox on Saturn. just giving ideas.
For my comic, i'll submit MashStache... although I do have other comics.
https://tapas.io/series/MashStache2
3 months later
@jensrichard77 Sorry your typography at the beginning threw me off. Its so blocky and I'm not sure what the type hierarchy is. Not quiet a fan of the text outside of the comics to explain what it is. Show not tell. I also think there is too much other info. Use your wall for announcements, so you can keep your comic clean, or easily to tell what is your story and what is other stuff. I also find that your panels are space very far apart, and I need a few mouse spins to reach the next panel, so just put them a little closer. your dialogue also says red, and blue in most speech bubbles which makes the conversation feel inorganic. I get you are establishing characters, but red and blue are very distinct, and this may be more important when you are surrounded by more blue colored characters. Sorry this is long.
@UrMom i would read your comic if i was into that kind of genre.
@BobbyjoeX Your character stats is the first thing that made me not really want to read your comic. I would keep that info in a character sheet or some kind of after chapter bonus info. When drawing a charater you should be able to see their age range, so trust your art. I also want to comment on the wobbly and pixel-ly speech bubbles. I think you can fix that in the future, I'm not sure why they are that way.
@antimekii I was going to say not my genre, until I realized SPACE. I would read yours if it was on tapas. I don't have a webtoon account, so I can't sub. I also don't particular enjoy the site layout (but that is not your fault, it is just what it is) I think chapter one might have been a little slow for me. But when looking at your comic I would like to see more texture in your environment. Your walls are soo smooth. How you choose to do that is up to you, but I think it will help your characters stand out because I find that the background starts to compete with its pretty, neat straight lines.
@Eightfish First of the pixel art in an interesting choice and unique, but I was put off by the info dump at the beginning. As a mildly dyslexic person large amounts of text will make me turn away. Its why I read articles over novels. Next I noticed that your panels in the beginning have different amounts of black around it. in #1. If feels like it is incomplete to have the blocky background for the smaller panels. I would jsut make sure all the black is the same size even if you are making smaller panels. That way the black surrounding it can help keep my attention in the comic rather than being distracted but the sudden white.
With that said, feel free to tell me what I need to work on.
Thank you @cjspiethillustr for taking the time to give me feedback. Lots of stuff to think about but most of it is all on purpose for figure out this media.
To return the feedback all I can say about your comic is that it is unreadable on mobile. Your comic looks so nice and the pages look so well organized if you were creating a traditional printed comic.
But for a mobile webcomic I can not read the text and everything looks so small.
And that's it. The rest looks so well.
Have a good day and I hope that you will return someday when my big comic Bunneh The Rabbit gets out. (I do have a ”making of” series that shows the progress but I feel that you are more into the real stuff and not me juggling with a storyboard, so let's tear that one apart when it comes out)