If you put lights where lights actually will be, it enhances realism.  Attached is a quick closeup I did on a scene where I'm playing with recessed can lighting (yes, she's dressed!).  The lights are the ceiling lights and light coming in through the windows. (I need to get rid of that texture on the glass!)

Also, you need an enclosed room or environment dome with an image to get the best effect from IDL.

As awadissk notes, texture is extremely important.  The wood floor texture in this render is fine for a normal shot, but obviously not up to snuff for a closeup.

Finally, subsurface scattering is available in Poser 9, which is easily applied to skin via the free EZSkin script...

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