How do you get glassy/glossy eyes in photography?

[fueledbykailey]

I'm pretty sure it's just sharpen, but that usually makes it look grainy. And I'm really trying to get that glossy effect! Here's some examples of what I'm talking about.

http://fc05.deviantart.com/fs22/i/2008/006/4/1/The_Day_The_World_Went_Away_II_by_SynthTwins.jpg
http://fc02.deviantart.com/fs29/i/2008/050/7/4/Lucid_Memory_II_by_SynthTwins.jpg
http://fc01.deviantart.com/fs19/f/2007/310/c/8/c829bc2aa46d1dbc.jpg
http://fc01.deviantart.com/fs19/f/2007/294/f/d/Zielonebabole_by_SynthTwins.jpg
http://fc01.deviantart.com/fs24/i/2007/322/c/b/Hanka_by_SynthTwins.jpg
http://fc05.deviantart.com/fs22/i/2007/328/0/8/pierogi_z_kapusta_by_SynthTwins.jpg

The last one is definitely the best.