Attached Link: http://www.renderosity.com/mod/gallery/index.php?image_id=1676988

Well for me I tend to put an alpha reflection into cornea material,simple black and white does nicely(; I found great flexibility lately putting the Poser texture folder into my collections and just doing it from there..no use to open posesr for rework anymore(; this came to me while working on eyes in fact(; Also, if you can get a good material for the eye white that has an even amount of veins and bloodshot it is nice to ad realism as well,and depending on your lighting scheme,a bit of luminosity is sometimes necessary(; you can see some totally done in Vue eyes in my most recent upload in fact to give you an idea..these are a bit extreme, but it was for the character...but maybe you get the idea(; Eyes actually got me into this love affair with creating digital illustrations so good luck on your endeavor:D

"Many are willing to suffer for their art. Few are willing to learn to draw."