I really like this image. Nice use of the wall and the shadows to give context, and a great expression on the baboon. Focus is a little soft, but I actually think that helps here. You're probably getting a lot of negative comments and down votes because it appears to be a zoo shot, but at least you didn't try to hide it. 7.
Outstanding candid. I think what really makes this though is the composition and included environment to the left (as viewed), which in it's starkness and brown tones totally plays off the feeling of sadness or loneliness portrayed by the expression captured. Excellent.