Well I tried to clean it up a bit. Quick n dirty patch up. (Note I only redid some of the left side)
(The ear I know your going for like an army camo effect) I would suggest bending it more etc.
Original PaintOver Animation Diff



My main focus on the brow / eye area was trying to eliminate your thick dark lines, with the "sell out" technique (I think thats what its called). Also getting the eye to look more devilish

and defined.
With the hair i think less is more, just messed it up (hair styling)

and then left it with as little as possible shadow.
The ear I just shadowed more plainly.
The colors ( I am not good at those at all) I think are to close to each other in color meaning they look way too similar, try and vary them further apart.

This you need someone else to help you with. I am trying to understand color myself.
I hope this helps maybe gives you some more ideas.
Regards,
SCiDT