I think I like this one the best out of your animal photos. The pose is just perfect, IMO and the crop feels right. Since the background is mostly dark I would probably go ahead and make it all dark at the top. I think this photo would work better that way than your other photo like this with the black background.
Edited to add, I meant to say I like this one the best out of your lion photos. The one with the monkey is may favorite.
The lion has great lighting and is a clean sharp image. The background however has a couple of beige lines that distract the viewer from the image. Too bad they had to be there.
A very good shot and nice capture.