kso, cnc time :P The general colours and shapes are fine, and pretty good in my opinion, though it might be an idea to do a complete contrast, so like one side of the face ripped open. He kind of looks as if he's just woken up and is glaring, like in a rocking chair. The face shape is also well defined. Things i would probably improve would be the contrast, since at the minute it looks like a normal head, maybe beat up the other half, bloody it up, which i assume you will do. you could also change the eyebrow, so it's like plucked off.
I would probably reduce the amount of grey on the less beat up side of the face to make it look like a perfectly unaged person :P my shitty cnc for ye. bai