Just read your notes. If it lost any detail to compression, it was not evident. I'm anal about spotting JPEG compression and I didn't notice anything. It got a 7 from me.
Took trip to the zoo, eh? :-) You handled the environment well. Seeing some artifacts of the enclosure and it's a little bit grainy. Nice detail in the hair. Good luck.
Pretty little beastie, with very nice detail on his face. The noise in the background doesn't add anything; I'd use noise reduction or blur it out of existence.