(felt this one needed an answer)
Admittedly, at any point, if you’re seeing work that is more polish than usual.
I’m more likely enjoying myself or the character(s)/idea far too much to stop at what was originally paid for.
(I can’t say there are any sketches that are picked that I dislike. I wouldn’t pick them if I disliked the character begin with. But there is definitely still characters, ideas or themes that catches my interest enough to really go a bit further if I have the time to.)

20-25 sketches are picked at a time out of all forms submitted.
So believe me, when I say, there’s plenty to choose from. If I’m picking a character it’s more likely I like the character or the idea enough to try my hand at drawing them.
Though, that doesn’t mean my first or second attempt at drawing the character will be as good as I originally wanted it to be. (But if commissioned again I do try to do better if I feel and/or I’m told I did poorly on my first attempts.)