looking at bright white on near pitch black is difficult... and since those are opposing colours (on the colour spectrum) it kinda hurts the eyes if you look at it for a sustained period, because of that people can't identify some of the elements.

first impressions were that it was way too clean... and the bottom half looks like a incondesence map, what i would do is if you want a white clay render - render the thing in mental ray with white background.

btw are you using shader glow?...