few crits
-spray can bg is a no-no, i would just use transparency if i was you.
- the hair is a bit to thin, and needs some thickening up and texture.
- to make this look a bit more realistic, perhaps change the black outlines to a darker shade of the inner color?
- fix his eye, it looks awkward.
- adding more contrast to the colors would be nice. i would defiantly use some darker shades.
anyway, this is a really nice piece, but with a few tweaks, could be a bit nicer.
who knocked you out anyway? i don't remmember.
(also, next botp, maby you should post your work before you submit it, this way you can improve it
)