WWII field medic

I know this aint nothing to do with warcraft, but i'll post it anyways.

I drew this field medic in about 20 - 30 minutes. I'm only 15 so i'm prett happy of how it turned out.

Please be a harsh yet usefull critic.

the only problem at a quick glance is that the ear is to small, and the head looks funky XP

only real crit i have is in the mouth. when you open your mouth, your upper row of teeth do not move, as in they should not be on the diagonal. the lower jaw does change angle as you have it, but the mouth looks strange as it is now.

Thanks guys. I'll keep that in mind next time.
Yeah, i'm new to drawing faces, i've only bin doing it for a month or so i'm still learning.
I had drawn the wounded guy next to him too but he was so ugly i was too ashamed to post it .

The purpose of this drawing was actually practicing folds in clothing and stance.