I did this image with an experience purpose of mix some technics to estabilsh a concept and an art direction for a 3D character.

I started with a base mesh head that I modelled in Silo, I did a brush based modelling in Mudbox beta to change the topology to concept this grey alien, after that I did a quick render in Maya with 2 area lights and a HDRI Map.

With that render as a base I did a PS paintover to better estabilish the final look of the image.

Sometimes I like to experiment and mix 2D with 3D (or vice-versa).