Looks like he had a black-eye. o.o
Anyways, this is the first time I'll be a bit, uhm, critical:
The way you blended his hair and the grass made his hair look like the grass' shadow. But that's understandable, since opencanvass is still far from perfect from the real canvass where not only fingers, hands, and arms do the link, but the whole body.
And yeah, I like your signature. My signature sucks. T.T