I go aganist using black for anything except outlines. Even worse when it's true black [0,0,0]. i use [32,32,32] for outlines, only :/
Also, i recommend changing more the hue between the shades, and making them more variant on the light source. Also, i recommend starting fresh and new, and showing us the outline, because there are some things strange... Odd. Like the eliptical shape based eyes.
That'a what i think...