The model was first blocked out by stretching out a series of spheres, blocking out this way helped give the robot a softer more organic silhouette. Then mesh was then made using Maya's Quad Draw, a very handy way to create edge flow across the rounded surfaces. While I've always been a Blender fan, this tool is far superior to Blender's implementation. 
The flat panels made UV'ing easy and the model was then textured in Substance Painter and rendered with Arnold.