Your texturing ability is amazing. This is looking good surt

.
I got a few minor discrepancies though.
-the last 'node' (donno what else to call it) on his tail looks like it's facing the wrong direction. I think it'd look much better if it was flipped horizontally, so the 'stinger' continues with the curve of the tail.
-there are some stray pixels along the outline of the body; on the tail, this works to your advantage, as it adds to the texture, but around the reddish parts, the legs, belly, and arms, these strays only seem to make it look messy.
-also, I can't pinpoint it exactly because I lack the proper anatomical knowledge, but there's something wrong with the legs/feet. Whether they're too short, or aren't sitting right on the feet or what ever, I don't know what it is, but it looks off.
But on a lighter note, I love the spikes on his back. His head, especially the beard and teeth, look great. Nice job so far, keep it up!