I know guys are immune to many of the subtle things girls do when they like a guy. What are some ways to show a guy you are interested in them without being too bold or too subtle, like for example a guy in your summer class. We were assigned a group project together (with one other guy) so that may create some opportunities.
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That's funny, 'immune' isn't the word I'd use, I think 'unaware' would be nearer to the mark.
Regardless; I think smiles are a good sign. If you give him a smile and a look that says "Heeeeey :)" it may send the right signal, while being fairly subtle. If you're kind of friends with him, or can at least talk to him, just kind of be attentive to him, turn towards him if he's talking. Just show you like talking to him, that you like being around him, near him, and interacting with him. That might be a little forthright, but nothing is really going to be a one-time-he-knows deal; You will need to continue to smile, give him looks, talk to him, and show you like him in small ways for him to pick up on the pattern.
But yeah, I think smiles and eyes are good.0