Quoting Twilight Hunter Very nice, If I had one thing to add, it would be additional arm articulation like allowing him to have the ability to cross his arms, as I have learned from experience that it makes for really good staff poses, I also would've liked to see the big spikes on his back flow in the same way as the others, but that's just in an aesthetics thing. All in All, really good, and I look forward to more from you. Later...

Quoting Gringat the Repugnant Very thin and serpentine. I like that aspect. To pull it off better I think the body could perhaps arch and hunch over a bit more and his torso (but not tail) could be a bit shorter as well. I like how you paid attention to Bionicle Canon and used the official colour scheme as well. Too many people would have made it green. :P