Programs used: Maya, Mudbox, xNormal, CrazyBump, CS5
The most challenging thing was building the material and finding render settings that I was happy with. Here's the setting I used. Non-specified settings = default.
Rendered Settings
Mental Ray. 4k. quality = 2 samples. no shadows
Lights
Directional light: intensity = 2.2 (yellow hue)
Ambient light: intensity = .4 (blue hue)
Material
PhongE
Color = map
Bump = map
Diffuse = 1.5
Roughness = map
Whiteness = slightly gray
Spec color = off white
Reflectivity = 0.0