This is how the skin setup works. Only diffuse texture is in upper right. All the rest is build inside the math room.

Click to enlarge, but I had to compress to get below 200K here. :-(

Displacement is driven by diffuse texture and a Math_Function  + turbulence.
Dark is less displacement, lighter is more displacement.

Blinn is driven by diffuse texture with ANOTHER Math_Function + turbulence
Lighter is more Blinn.

See that darker area's like brows get MORE displacement, and LESS Specular-Blinn.
As it should be. :-)

All driven by the same diffuse texture.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!