Boys, how can I tell if you think I'm pretty?

I know this question may sound stupid but I'm just curious if there's a way to know if a guy thinks you're attractive. That is without talking to you.

i just want to know if this guy how to say this "likes what I look like?" Because I'm really attracted to him and even though we never really talked I think he'd be a great guy to talk to (he's shy so I'm assuming he wouldn't turn out to be a jerk) he looks at me sometimes and I just wanna know if he thinks I'm attractive (since I have a VERY low self esteem)
Boys, how can I tell if you think I'm pretty?
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