I think saturation is enemy of skin shaders. Saturation of information.. Photos pick up skin blushing(sss) as well as its translucence. Its alternate highlighting along with its specular .  Reflections are hard to see on a white skin but they are there.

All these should react to your lights or scene and not be part of your texture. Stripping all that out leaves a ton of nodework to get it back in properly. Not for everyone but you could handle it. I see collarbones with shadows on this texture. The white "highlights" painted on her belly...nice 2005 tricks but bad in 2012

I'd like to see a way to ramp in blush. Not there yet.

A good spec map with a clean alfa texture using Snarly's EZ skin..and patience