1 - Some skin shaders look roughly the same rendered or not, while others not at all.

Before render,  they look like some kind of weird shiny plastic, making it very difficult to guess how the light set is going to work and how the render is going to look like.

Why is that so?

 

2 - I just got a new character for V4 that has 2 set of shaders, a standard one and one for Poser Peo 2012 using SUBSURFACE SCATTERING.

It's quite difficult to appreciate the differences on the promo pics.

What is it, how does it work and is it worthwhile?

 

Thanks