You captured him very well, the expression on his face says everthing, just look at those sad eyes, they don't belong in a Zoo ...*that's my opinion ofcourse*...but this guy doesn't know any better than to live there.
It has a good clearity and composition:))
I share Twinkel's reaction to zoos: I find them, even at their best, to be barbaric and cruel places. But all that aside, this is a beautiful photo and it moves me. Well done.