All of your animal/creatures have really good proportions but the Siamese Lion's forearms are a little long. (Unless you were going for that since Siamese cats are very long and thin.)
I really don't see anything wrong with your art. But maybe you can work on your proportions/perspectives? The mew one is flawless with proportions/perspectives. (But the paw is in an odd angle.)
These guys are Phil Dalhausser and Todd Rogers the USA men's beach volleyball team. It's just so plain...what should I add in the background? I thought about doing spectators but I have no clue how to ...