One thing I often tend to forget (and really need to remember) is that the first few drafts of something — a painting, a story, whatever it is — are usually imperfect, and that that’s okay. I forget that and get discouraged and give up, but I’m fairly certain in hindsight that many of those abandoned projects would have turned out fine if I’d stuck with it and iterated a few more times. (Especially if I had let things sit for a short while and then reviewed the work to figure out the specific things I needed to fix.)
Moral of the story: Keep calm and carry on.