Alright I got two options here
Plan A: Ask if she likes video games, offer to play some Smash, slowly win her favor with my incredible charm and wit.
Plan B: Tell her she’s cute
Here's some absolutely serious advice.
Don't focus on her attractiveness if you want to make a genuine connection, because a lot of guys probably give her disingenuous "you're cute" compliments already. Just try to
talk to her like a normal human being without focusing on the fact that she's physically attractive. You're learning about her in a way that isn't just skin-deep. That's important to even knowing if it'll work.
Assuming you hit it off and start talking/hanging out, that's when you should share that you think she's cute, and see how she responds. Be confident. Even if it's just a front, confidence is one of the most important parts of this whole song and dance. Be you. Be confident in you. Don't be afraid to tell her the things you like about her at a reasonable, acceptable pace.
First just talk to her about pretty much anything and go from there, dude. You'll be fine. If nothing else you'll make a new acquaintance.