This is a pretty cool concept man! Reminds me of a bull towards the end of a bullfight, except alot happier.
My only crits (if you don't mind.) are that the uv's need to be actually laid out rather than a flat projection from the side, give both sides some attention and break up the mirroring in your uv map. You can see the stretching across the top of the body, and I think it detracts from the overall appearance. And I would make the knocks in the pectoral fins a bit different per side.
But really these are just picky artistic opinion crits. Other than those little things, I think this peice is great! Super cool character, and I would love to see it animated as well!
-Z