I know this sounds kind of crazy but it has worked for me on more than one occasion!
I love this painting now but it started out pretty bad! I mean, really bad. I felt like crap just looking at it. But now it has a level of depth that I really appreciate.
So what are you waiting for? Why not pull out an old canvas that wasn't working anyway and see if you can paint the worst possible painting in the world? You may be suprised at the outcome!