just to say...

in my opinion, i'm getting results are pretty close to the limit in terms of what i want from skin realism.  that is, i think you don't have to do any more tweaking to the skin shader unless it's just fun.  as an engineering friend of mine says, the last 1% of errors takes 99% of the effort.  not discouraging you at all, but letting you know i think you've already done an incredible job.  i've finally got my default light and dark scenes, and i'm (personally) very happy with them. i'm now hitting the limits of Poser and the content available for it.  and it's about 10 times as hard to deal with them because the level of realism is so much higher.  i want an effective picture more than i want realism, but i also want something consistent.

you've taken skin far past where everyone else has.   and other materials, of course.  i mean, the only gaps for skin i can see is that unrealistic almost mollusk-like extreme translucency popular to CG (like Golem from LOTR) and the realistic translucency to older skin due to a thicker epidermis.  one usually isn't your thing (since you're into realism), and the other is only rarely needed and needs special conditions to observe.  and i'm just not sure those are possible without non-buggy translucence, though if they are they're probably already in your new shader. 

so thanks a lot.