This is my first attempt at a head in mudbox. This video is in HD, so pick the highest quality to see the detail. Picked up some useful techniques doing this, especially dealing with realistic skin folds and wrinkles. All of the detail was drawn by hand at the poly level, with only the skin texture drawn from a texture map.

The next stage will be to import this into Max, setup the displacements, and build a nice sub surface shader for the skin.