Not too impressed with any of these to be honest. In the first the shadows are too harsh for the main focal point, expose for the shadows... Second the bokeh on top and on bottom is way distracting. Last one, you have way too deep depth of field. That background is ugly. Lower your f stop and get a narrower depth of field, that way the background gets blurred out and your subject pops more. Much better job of exposing on the third with the light coming from behind the subject. Lastly, if you are going to the zoo, I want to see the animals! Why not fit the entire animal into your frame? Surely you have some shots doing just that? Share those!