Haha this is a bit cheesy no offence. I mean sure she would be flattered but if her eyes are as gorgeous as you claim she might have herd it a couple other times from other people, maybe to a point of it being annoying.
Besides women like men like to be complimented on stuff they have earned. Maybe she is really smart but no one has acknowledged it, then compliment her on her smarts, or maybe she has a wicked sense of style or a sensible yet zesty style where she adds hints of color or pattern compliment her on that. Or you can compliment a small detail that no one has noticed before and she will see that you have a good eye for detail and can pay attention.
I'm sure she would thank you and smile. But on the back of her mind she may think that you are probably lying and trying too hard to hit on her.
If you really want to impress her describe to her something nice that they remind you of. Like if her eyes are of a certain color (i.e. hazel) tell her that her eyes are like "beautiful drops of honey." It may be cheesy too but that took more thought into it so she won't take you for a creep and instead may make her giggle or blush a bit.