It’s rendered in cycles rendering 4 single images (.exr) with 500 samples then joining them in the compositor with a mix node so the resolution is about 1800/2000 samples…
This is a previous render I did, in this versione the “android” write is added in GIMP, but the Droid’s eyes are partially visibles, hope you like it http://i50.tinypic.com/t98t95.png