Just let your eyes meet for long enough to let him know that you're looking intentionally, and didn't just happen to be scanning the room. [substeps] These first fleeting looks is where the spark of attraction is generated.
[header] How to flirt with a guy with your eyes [title] Meet his eyes briefly. [step] As you're keeping tabs on him out of the corner of your eye, look over at him periodically while he's looking at you and allow your eyes to " brush. " don't maintain eye contact for too long yet.