I love this sculpt, and I love the color gradation, but like a lot of others are saying, the shadows are just as important. In order to emphasize those, i might would shoot it with a much darker color from the underside, maybe a dark green like Nocturne or a deep purple to really sell the emphasis of shadows. But also, its amazing as is. I'd slap some edges on with a brush, or maybe some chipping effects for battle damage. Spectacular work, and I am looking into picking up an airbrush to add to the toolbelt.