This one looks very original, at first I was a bit unsure of the spires on his back, but now that it's all finished I say it fits rather well. The texture of his skin is amazing! I'm going to have to steal that trick for later hehe.
The only thing I would've done differently is the fur/hair down his spine, it could be rendered a bit differently so that you could still see the shapes that poke out of his back. At the moment they're a bit hard to see.