Here's my Robust model M7-002. Model created in only a few hours — including a hollow inside for the 3D print — thanks to MoI's unparallelled workflow.
I started a thread at the BlenderArtists forum, with two renderings of my second Robot bust design, done with two different renderers: Cycles and Luxrender.
I have not used either render tool so I can't comment on which one was used but I have a preference for A. It seems just a little more subtle to me.
Good work!
cheers,
eric