Direct X 10 rendering... Just look at the realism achieved.....

The first one posted actualy looks better. The lighting on the right destroys this one alot (along with some of her facial expression).

 

subbie is correct. her lower lips and teeth are far from human as well. Her ear also is not very convincing. Finally, for the amount of fat she's supposed to have on her face (cheeks), assuming she's around 23-4ish, her neck is too thin. These are all little details I came about when I started doing faces on hand.

 

I think it's the skin texture that gives the 2nd pic away the most. It looks too much like plastic.

 

The 2nd one looks like it was designed by someone who only regularly sees women in porn videos or anime. The proportions are all wrong - it looks more like videogame Lara Croft than a human.