Good: The Enemy of Great or My Least Favourite Part of Painting

So right now, as you can see if you scroll down, my painting for Kie is looking pretty good. I like how some of the new colours and forms are balancing it out and defining it. Therein lies my problem. Right now it looks pretty good. It's not finished, but it looks good enough that it makes me hesitate. I want to leave things, I'm afraid to mess with what's worked so far. But I know it's not done, I know that I can make it better. It's a frightening place to be in art, or any creative act. Here goes...