As an artist some paintings work and some don't. When this happens you of course are not going to throw out the canvas, at this point you have two options, gesso it back to white or paint it some other backgound color. In this instance, I painted it black with glimmers of the original painting color peeking through here and there for some warmth. So now I am making a fresh start with an interesting background with some fun texture from the previous painting.
I have drawn out a tulip in white from a photograph from my yard. The tulip was originally pink but I am not sure what color I should paint it yet... back to the studio to find out, will post another picture after a bit.