Attached Link: http://www.renderosity.com/viewed.ez?galleryid=756153&Start=1&Artist=cake1&ByArtist=Yes

Well

On my opinion, what makes a skin look realistic is :
-texture
-bump
-light and shadows (otherwise, it looks all flat)
-and maybe highlight, depends on the effect you want to give.

a lot of possibilities, but what i would suggest on this image would be first to get rid of all the lights you have that make that global illumination...

Then add one spot, and maybe another one, and see how it goes. when you like it, post it here, we'll see if there is any difference ;o)