I do this too! I do most of my 'writing' in the shower or car, where I can speak through dialogue and conversations out loud! I jot it down afterwards.
Old age school students tip: clean the eraser first by rubbing it on the nearby wall (or any surfaces that won't dirty the eraser), it will scrape the troublesome part that will make the smudge.
Also, I believe in Pentel eraser superiority.
Some panels I dread making so much that I hold off on drawing them until the very last minute. Including backgrounds.
top 10 art related problems that I've (stupidly) done:
- Looking where is the ctrl+s button when I'm about to leave the room when I am drawing using pen and paper
- isn't this too smooth for a paper? - when I'm doing digital
- using two fingers to zoom in -- on a paper
- rotating the whole pen tablet while doing digital instead of rotating my actual canvas
- using an actual eraser to clean up lines instead of using ctrl+z during digital
- Why isn't it moving?!-- sees hand using an actual pencil instead of a stylus during digital
- Why is this not writing?-- sees hand using stylus instead of a pen
- waiting for the brush to switch color with the color i had in mind --- during traditional painting
- walking in art store, buys a handful of blank notebooks, arts and crafts materials then forget about them for about 1 month before actually using them then repeat
- when it comes to paints, one color is either too much left over or one tube isn't enough at all
Dipping the paint tube in the solvent instead of the brush 
Fortunately, I have not yet tried to drink the solvent. 
Yeah! This is the reason why I have my own bathroom at my house. I even opted for a higher-price, cramped storage-like dorm room on my last college. Although the dorm room literally looks like a CR (Comfort Room. Don't know what term other countries use but it's like lavatory) up to the walls, I still went for it because that's the only place available with a bathroom (bathroom = CR).
I, most of the time, spend 2 hours inside and sometimes if the scene is intense, it'll take 5. It's to the point that I dread going to the bathroom sometimes because I don't know what'll happen once I'm inside.
When I was at my dorm, I usually wake up at 3 in the morning even though my classes starts at 7. And I'll only have enough time to put on my uniform - no makeup, no combing. wet like a chicken, off I go to school. I HATE MY BRAIN FOR AUTOMATICALLY PLAYING A SCENE ONCE I STEP INSIDE THE BATHROOM URRRGH!
FWIW I label all of my layers (mostly because I don't want the program telling me how many layers I've got -- it can be scary) and I STILL DO THIS.
Forgot about a semi-huge artist problem I had last year (and am still dealing with a little bit right now): supply shortages.
This isn't an issue for digital artists (unless your tablet dies, in which case, you're outta luck...), but I spent half of last year wrestling with getting refills for my Copic markers, because Copic was redesigning them, and that, combined with the pandemic, meant that basically everything was out/unavailable or in extremely short supply for months. It's better now, the new refills are finally available for the most part, but there was a while there where I was out or nearly out of like ten critical colors, including several skin tones I rely on heavily.
How many colors have I had to wrestle with getting my hands on? Well, since last year, I've replaced 44 colors. I'm still waiting on two that have been infuriatingly hard to find. (YG13 and YG41, fwiw.)
...sometimes it'd be nice to just be able to use a color selector, not gonna lie. XD
Art
- Having to draw a recurring bg that I didn't know was gonna be a recurring bg. Leads to door knobs constantly flipflopping sides between panels.
- Drawing thumbnails when I'm half sleep, so when I go to sketch later, I can't tell what's going on.
Writing
- Scripting out dialog, but not detailing the camera focus or setting. Very helpful of you, past self -_-
- Thinking I'm writing a masterpiece, only to wake up the next day realizing it was all senseless drivel
@Rocksteady_Comics I went to sleep once, forgetting my apple pencil was on my bed. That thing's $100!
@migxmeg I've tried to pinch zoom and rotate paper before too
@WhateverTheTurtle that happens to me everytime I'm in a situation where I can't write or draw
@Yulek That's the curse of school settings, even universities. I think I'd die trying to attempt an auditorium or lecture hall.
Stupid writer brain problem:
"Yeah, this music is perfect! Choreographing this fight scene in my head is so easy right now."
Song ends.
"Welp, I guess I'll never get that flow back without that music now. Time to listen to it on repeat and struggle to sync up the scene futilely for an hour before begrudgingly finishing it in silence."
If I accidentally kick the cord to my tablet, my calibration becomes off and it won't let me recalibrate my tablet unless I restart the computer. 
It's one of the few accents I feel confident with (though I'm sure any actually Scot would disagree). It's my fav.
Dear secret services all over the world,
I am not a serial killer.
...
Nor am I a terrorist. Nor do I intend on hiring a hitman. Or poisoning someone. Or employing various types of psychological torture. Nor do I want to start a war.
Where the fuck is my stylus. Where the fuck is my other stylus. Where the fuck is my third stylus that I got in case I lose or break the other two on a Sunday.
My tablet keeps disconnecting because I don't know, the driver or the firmware might be outdated, but are there any updates available on the Huion website? No, no there aren't. Will I buy a new tablet?
...
Maybe. It's not like I have too many of them already.
Me: I don't do too much research.
Also me: googles the history of the bucket.
Also me: studies a 3D reconstruction of Franz Liszt closely to find out what his ears might have looked like.
...
They were swirly.
does a lot of research into historical figures my main characters are based on
carefully constructs a character based on what I found out about them
finds out random historical fact
has to rewrite half of the plot
finds new information about historical figure that would make my carefully researched and well thought out character based on that historical figure terribly ooc and historically inaccurate
Also, the amount of times I've forgotten a word in every language I know ... the thing. I mean the thing that does the thing. With the thing. The thingie. A writer I am. Very articulate I am.
Punctuation. Period.
And lastly, I have 5 comic ideas, of which at least 3 are big, long-running projects, as well as a novel trilogy, and I would love to be a professional musician some day, even though I'm already in my mid-twenties and didn't go to school for music, and meanwhile my thesis is staring at me with that "I am not angry, just disappointed" look ... but I feel like that's more of an existential thing so I'll end this here. 
Ohhh that must be the worst!
But maybe using Croppy might help? That'll resize your files for you and split them up, so you don't have to do it manually and can keep your files as they are.
Also I forgot the most obvious one: the amount of times I have coloured on my lineart layer despite labeling all my layers because I am stupid ...
