Really cool creatures! I like the consistency with the legs, it helps the creatures feel like they're in the same world as one another. Great color palette too! The top creature has some nice stuff going on with the head, but as it travels down the back it gets ambiguous to me what exactly is going on. Are those tufts of fur or are they scales? Or horns? Maybe add some more definition to what textures and forms these are exactly. Overall Great job!
Great use of the texture overlays. The best part is that they aren't overly dominating and you have to get close to see them.As far as the overall design goes, your design is definitely one of the more unique ones. Its easy to see that you did a lot of research and a lot of planning/thumb-nailing to get there. Stylistically, however, I feel that you may be loosing a bit of your idea in the sense that the head, torso, and back legs are pretty intimidating with very tone muscle definition, yet his front leg is very round and soft. In the end, that juxtaposition can be a little distracting.That said, there are probably multiple ways you could go about fixing it. My personal gut reaction would be to simply render out more muscle definition in his forearm. I would look at gorilla and maybe chimpanzee forearms (and probably just the muscles at that, haha, you don't want to render fur) since they walk on their knuckles like this guy does.
I like the freaky rabbit. I personally would have rendered out this guy just because he's a more believable creature. His body structure is the most interesting. The dragon is interesting but is more of a fantasy animal to me. I can't quite imagine how'd he move around because of the centipede/gorilla arm combo. Maybe if he was a little more rendered out, I would be able to picture it better.
With the first creature I love the sense of weight on his front legs. I would line the back legs up with the front legs so that they look like they're standing on the same plane (currently they're slightly too high). I would also add more texture to the creature. The things on its back are hard to distinguish because you can't tell what texture they're made of. Are they fur? Scales? Flippers? Maybe some more line work would even help to define them. I love where the second creature is going. I agree that he's more believable than the first one.