Firstly, the arrow is driving me nuts as it is on the wrong side of the bow.... archery does that, anyway, on the the critique
The ears feel too high on the head as if the were attached after the fact
the right hand feels like the fingers were attaced from a different person, they seem to large
Your linework is solid and dynamic but the right arm...
if you drew an x-ray through through the head, what would you see? it just feels off to me.
Finally, the left forearm feels to large, almost swollen,
all in alla solid drawing and i enjoyed seeing it.