hey
more edits, two new edits, and reduced colors
Well I decided to further do my edit, as my original didn't seem to be enough to get my point across. Again, I think it really lacks lighting and depth. Although I think it did lack some contrast, this isn't the problem. I advise you to use a light source from above, and to try and vision how the light reflects off him, and not worry about the tail or whatever else until you fix the lighting
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I also found that your lines were quite jagged, and needed some cleaning up. I must say that I think he is well designed, and the lines are quite well placed. I think it's is very important to clean your lines up before you start to add any AA and such. Ohh, I also thought the perspective of the top of his right leg was a bit off.
Finally, I don't seem to like the wrist bands. Hmm, they seem to me more like a way to hide his odd left wrist or whatever, I dunno :\.
Anyhows, I hope this helps.
cyas