Even regular lights do not properly add the ambient occlusion in corners and recesses. For the most part, it needs to be faked or the scene will lack a quality of realism.  With the addition of the RGB Color Ramp node in Poser 13, the occlusion can now be easily controlled in the image.

That specular map looks horrendous. It should be toned down considerably.

I just noticed that the Subsurface scatter method is improperly set. It should be fixed random walk; otherwise you will not see any true SSS.