I find that oddly reassuring. There are times when I've done all I could with a painting and am still not satisfied with the outcome. There are other times when I get so sick of working on one painting, that I hurry up and "finish it," because I am so bored. No surprise there when the result is lacking. But, the alternative - cranking out a work when your heart is not in it, can suck the creativity and joy out of the whole process. So now, I take a painting that is finished or almost finished and I stick it on the wall for awhile.
Over the following days, weeks, or months, I will look at it and usually come up with ideas or changes I could make to improve it. I don't pressure myself. I just hang the painting and let it kinda percolate on the wall. As far as worrying about when the creative juices will flow again? I don't. I let the deep sleep. When I'm ready, I add or take away from the piece as I see fit. Then I stick it back on the wall again to see if anything else comes to mind.
I did that with my flamingo painting. I was not satisfied with my first attempt, although I called it "finished." So, I stuck it on the wall. I just couldn't reconcile myself to the lackluster pink I had used to paint the flamingos. I started searching for coral paints and discovered one by Lefranc & Bourgeos that knocked my socks off ! Funny how a new paint or brush can be a total mood changer!
I reworked the flamingos and added a few new ones. I wanted to instill a little fun by having a flamingo staring out of the painting at the viewer. I'm much happier with this piece, but am I done? I don't know. It's going back on the wall for awhile, and I'll let you know when it's completely percolated!