What makes someone have pretty eyes?

The_Box
Both girls and guys talk about how they like someone with pretty eyes or eyes that convey emotion. From what I've noticed, eyes are the number one feature that makes someone attractive. I'm no different;I love pretty eyes.

But really, what makes eyes pretty in the first place? I have a really hard time understanding why some eyes are prettier than others. I can't even tell if my own eyes are pretty, ugly, or whatever.

And how do eyes convey emotion? People say this a lot, but I don't see it. What makes someone have emotional eyes?
What makes someone have pretty eyes?
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