What are some ways to make photo realistic people?  What I mean by that is a picture that can be fooled by others into thinking that it is a picture of a real person.  It seems that still lifes are easier to do that renders of people.
 I have been told that something about the eyes make it looks like it is a computer done  person verse a picture of a person.  How can I get better looking eyes if that is the case.  I mean the whole eye not just the textures of the eyeball, but the area around the eye including the eyelids.
Thanks for any help