I have a little list.
Exposition before the story. If I need a school course before I read your story, why should I want to read it?
Big reveals that are actually not important to the plot, characters, or theme of the story, but just an excuse for a splash page. Pretty art. Why am I looking at pretty art, instead of reading your story?
Splash pages. A traditional western comic is 22 pages. If there are more than three splash pages, there had better be a damned good reason. If you are putting in a splash page every 2-3 pages, just to show off your drawing skills? Pretty art. Why am I looking at pretty art, instead of reading your story?
If you're going to be late, and you want to let the readers know, do so. Do not stick in a pinup, because then when I am binge-reading your archives, the story gets broken up by a pinup that has nothing to do with the story. Pretty art. Why am I....never mind, you get it by now.
A slow plot. I will read any on-going title to the 20 page mark. By that time, I should have figured out most of the 5 elements of your story. I should know who, how, where, and what. I might not know why yet, but what that means is your characters, your conflict, your setting, and your plot. Your theme might not be apparent yet (although there's that stupid screenwriting formula that says a character should state the theme in the first act. Balderdash) but I should be starting to see it. If I can't, I'm gone. Unsubscribe. No, I will not stick around for pretty art.
Any story that feels like it is being written a page at a time. If I don't feel like you know where your own story is going, why should I trust you to take me there?
Bad art will not kick me out of a comic. I'm here for the story, not the pretty art. However, bad composition, bad page flow, and bad balloon placement (or that sillyness of no tails on the balloons) will. There is a method and set of techniques for those things, and there are plenty of simple tutorials on the web. Please research them and learn them.
By the way, if you have a good story, and pretty art, you have a fan in me.
I don't mind if you use cliches, tropes, stereotypes, or recycled Shakespeare plots. Just put a new spin on it. Make it clever. There are no original stories. We could fill several pages with just the 'new, original' movies and books that were done with a new body, and a stolen engine of Bill Shakespeare. Just rub the serial numbers off, give it a paint job, and people will love it. But please, give it a paint job. Be original in the way you tell that old saw.
Eagle
(Yeah, I'm done. For now)