Mess it up?
(what Colin always says to me when I'm whining endlessly about not knowing how to make a bad painting good.)
There's a quality to painting which I find brave, and partially what drew me to paint in the first place. No erasers. No delete buttons. You just have to go with it, and handle the consequences. I'm sure there's some sort of life lesson there.
When I get stuck on a painting, I have to mess it up in order to continue. Do something drastic. I think this is part of that don't-make-it-good mentality. For some reason, if I sploosh paint all over it, it resets my brain when I'm looking at it. It stops the painting from being whatever I was stuck on and makes it something new.
It takes me days and days and days and days and days and days of staring at the piece to arrive at that, though. I always do, and it always takes that long.
That one is just about done. I have 4 (and a half) others in full swing.