How to get caught looking at a girl, without being awkward or creepy... but still conveying interest?

Diputs
What's the best way to check out or get caught admiring a pretty girl without being awkward or sleazy and over-confident? Girls, what kind of eye contact and glances does a guy do that makes you feel flattered and warm and fuzzy?

And on the flipside, what do guys do that annoys you (just so I know what not to do)?
How to get caught looking at a girl, without being awkward or creepy... but still conveying interest?
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