I like the materials and whatnot, but I feel that there are certain parts of the model that need some sharp edges. Don't know what program you use, but the way I do it is that that I just separate the geometry like so:
The model on the left is just a cylinder with smooth shading and nothing else. The model in the middle, however, is a cylinder with smooth shading but with the edges split. The one on the right better illustrates what's going on in the middle.
I think this might improve the bottom of the platforms a bit, as well as the gold bars, jewels, and other little things.