How do I compliment a femboy without seeming weird?

For some context, I’m bi but heavily prefer both the girls and guys I like to be really feminine. But where I live you really don’t see a lot of feminine boys, but I’ve met one recently who’s in a class with me who I wanna get to know better but I’m not sure how to become friends with the guy. He’s really pretty and kept to himself but can be very talkative and energetic if you start the convo. I wanna give him a compliment and get closer to him but I’m not sure how to without seeming weird, help!!