Quote - Most poser Figure meshes /textures Look Like utter Crap in hi end Physicaly Correct render Engines.

 
The problem is the lack of human skin illumination model, Phong, Blinn, Torrance or Fresnel models are not for human skin. Forget subsusurface scattering, it has very little importance and only adquire some importance for some lights and camera angle and when this happens you must remember that human skin has hair and the hair effect is very much important than SSS.
Is much better to have skin hair and ignore SSS than the opposite. In most cases you can ignore both.
If you haven't a good human skin illumination model you have to live with what you have. In Poser you can use a combination of shaders to simulate human skin, but this is the same as you do in Photoshop with brushes. The result can be very good in both case, but you are painting and not rendering.

You can experiment with this recipe with other rendering engines includin g Poser itself, that also is an approximation to a real human skin model:

1- Ignore and deleter all the shader tree.
2- Use only texture map, no specular map or other.
3- For the monent, no bump maps. Bump maps behaviour depend on the rendering engine. Later you can create one that is good for your case.
4- Set ambient value to 0.
5- Set diffuse color to 255,255,255 and value 1
6, Set specular color to 64,64,64 value 1

Until now, all is conventional and you have Poser4 Here comes the difference.

7- Set specular exponent to 2. A very low value and large highlight are. An unusual value. Large exponents make skin look as plastic!

And the most important.
8- Uncheck apply texture to highlight !!!

Human skin specular color doesn't depend on the skin color, black or white people have almost the same specular illumination.

For PovRay users.
9- Adjust the brilliance value for diffuse color.

If the figure looks to much bright or white, decrease the illumination, use a darker texture or decrease the diffuse color.

Stupidity also evolves!