The thing that stands out to me is the expression on his (assuming it's a male of some kind) face - he seems distrustful, appeasing you (or whatever he's looking at). Seems a little more distrustful on the top picture - possibly due to the heavier shadowing around the right eye.
Possibly most striking however is the fact the despite the fact he's obviously damaged, he doesn't appear at all afraid.
Possibly most striking however is the fact the despite the fact he's obviously damaged, he doesn't appear at all afraid.