A picture has to start somewhere. I suppose a sketch is an easier place than some.
And I guess I should explain. I didn't wind up using the flat colors. At that point I realized that I had forgotten to take into account the character's markings when I was blocking everything in, so I eye-dropped colors from the ref sheets to see which character to put where. Then I started over on another layer, painting in colors that I thought matched the markings and the lighting of the scene. That was the hardest part, because of my mistake. XD