It looks pretty great, but pretty monochromatic, and nothing pops out at you, and something that the head, in my opinion, especially needs. (contrast will help this.)
About the monochromatism, it makes him look like a statue. Making his eyes and teeth white, or some different color, might bring him to life a little more. I also don't think a secondary color all-around would do any damage, either, but it is your design, so it is up to you.