Yeah the robes could flow better and accentuate the overall look of him. I visioned in the books that he was quite thin, the long robes could help that a lot.

I would also be tempted to make a layer on the head in Z and then sculpt i with some reptile style alphas (think theres some on highend 3d) to give him a big snake like look and move more away from the movie look, the layer you can then dial in or out depending.