Eye

[Agilfire]

Here is a picture that I took of my friends eye about a month ago.

[Rai]

looks really fake, and your friend should was the area around his eyes more often
something I would have done :

Don't edit other's work without asking first. It's a forum rule. http://www.gfxvoid.com/forums/showthread.php?t=22169
/Rabieshund

the shot itself is nice tho

[stanx]

tip: make a big picture about his face, then crop the eye, cuz then the focus will be much better, and on the first pic the blue part dont fit everywhere to his eye, so you could work on a little more on that but nice pic, gj

[Deadloader]

Yeah the blue part, i think what you've done is use the red eye replacement tool.. not a good idea for colour changing use Image>Adjustments>Color Replacement, much better effects also to take the solid edge off of it, blur around the edges with a low pressure brush.
Though going against my advice, i suggest keeping the natural eye colour.. it's much, much more interesting anyway, the colour picture is better except perhaps take down the sharpness of the lower eyelashes, it takes emphasis from the eye since my eyes are drawn there..
..except if your focal point wasn't the eye then ignore that..