That's all we can do, draw, draw, create, draw and draw some more.
I'm not sure if we leave it up to we artists if anything is EVER done. You just have to be firm with yourself and say, I give this many days to a piece, and then I say it is DONE.
Of course giving advice is easier then following it, eh? I've been going back and forth on a few pieces at a time as well. But, sometimes it's just good to have that option of a few pieces at once.
Good luck and keep going @twirble
Sometimes I just decide a piece is done "for now" and put it away. When I decide it is finished I either go back to it later or work on it more. Thank you!