Noo, it's not only a colormap on a scanned headmodel. It's way more than that. It has sss with multiple layers and bumpmapping and much more.
NVIDIA's GeForce 8800 Ultra demo "Human Head" uses a new sum-of-Guassians formulation of subsurface scattering within a multi-layered skin model coupled to deliver a startling leap forward in realism for real-time characters. "Human Head" computes 17 off-screen textures every frame totaling over 40 Million pixels, each shaded with lengthy pixel shaders That amounts to 1.2 billion pixels every second! Ultra high resolution 4096 x 4096 color and normal textures provide photo-realistic detail even at extremely close ranges."
You can download it and try it yourself from here if you have a relatively new Geforce card. It works great on mine, a 8800 GTS 640mb.
http://www.nzone.com/object/nzone_human ... loads.html
/ Max