The Ultimate poser skin material would have a pre-scatter map, a scatter map, a mean_free_path map and the usual normal and specular maps.

 

Here is my latest shader, this is a single custom_scatter node combined with a clay node, finished off with microfacet and phong node for specular.
I think the specular could be increased a little, but otherwise I really like the look of this.

top left is simulating a single studio light that is very diffused
top right is simulating daytime outside
bottom left is simulating a close light (like a torch) under the face
bottom right is simulating night time

TemplarGFX
3D Hobbyist since 1996
I use poser native units

167 Car Materials for Poser