Originally uploaded by Buntekuh.
The eye is so perfect, it looks like a soap bubble.
Alternatively you may want to play marbles with it.
But you won't because you're afraid to scratch such a perfectly polished surface.
Composition and focus are excellent, and help making the eye the superstar of the shot.
I particularly enjoy it because I've taken photos similarly themed but without having the idea of doing a close-up on the eye.