One mini comment, the circle in the middle is assumed to be a sphere, like a planet or something, yet the face remains flat. It is creating an optical illusion of being flat and spherical at the same time and makes me eyes go weird... Either distort the face a bit by changing the 'Perspective' using the transform bit.
Also, not feeling the lighting or colours really, You've got the shadow under the main planet thing, yet the rest of the piece remains one shade nearly. You could use some serious burn tooling around the outsides of the piece. Pretty cool, trippy concept, I like it.