A quick test to see what the head was like to render with the same render setup that I used on the MK models. I used decimation master in Zbrush to reduce the poly count going into Maya. Worked great.
My render passes are an occlusion, reflection pass and color. For the color I used a Physical Sky.The reflection is just a blinn with reflection blur turned on under the mental ray settings. Then a quick mockup with Photoshop. Ramps for background, then the col pass, next the reflection pass(made this blue but it could be any color so we have some infomation to work with when adjusting the Hue/Sat) on overlay and lastly the occlusion over the top (multiply) to bring some details out.