Attached Link: TUTORIAL : How to achieve more realistic skin textures in Poser 5

Skin: See attached link. That's face_off's tutorial on setting up really great skin shaders. Face_off also sells a set of python scripts that make that setup very simple to apply. It's sort of complex to do it by hand.

Reflections in eyes: You won't get any specular highlights from IBL alone. The simplest way to fix that is to add a light to the scene, pointing the way the light from the IBL falls, and set it up as a "specular-only" light: In the Material room, select the light and set the Diffuse color to black, and the Specular color to white (or whatever color the light is).

If you want more detailed reflections, I haven't tried this, but I suspect that if you have a spherically-mapped environment you're using for the IBL, you may be able to take that same image and plug it into the Reflection node on the eyes, for a quick environment-mapped reflection. Like I said, I haven't tried it, but I believe that both IBL and the reflection node take sphere-mapped environment maps, so if we're lucky, they'll match up...