I have a stack of unfinished paintings from early last year that I'm finishing up so I can move on. These are all small ~ 5-1/2 or 6 inches square.
My strategy now is to work things until I like them they way they are. I'm not one to continually rework something to make it "better." And if I'm not liking something and it can't easily be reworked to be more pleasing to my eye, then I'm tossing it. It's not worth my time and energy to rework and rework and rework. That's beside the point for me. The point being, I don't care if it's "good," I only care if I like it and if I've enjoyed making it. If it also turns out to be "good," then so much the better.