Great restaurant in Austin, TX for senior prom!? :)?

Okay, so it's our senior prom and there's gonna be 20 of us in an Escalade Limo! But we can't seem to decide on a restaurant. So I could use y'all help! The type of restaurant we're wanting is one that's really nice, and with the dress being at least Upscale Casual. And it has to he beautiful so that we can take pictures when we're there. And even a place where we could show off the limo? And also that's peaceful and stuff. A lot of criteria, I know haha. But anyway, we want it to be the perfect night, so all USEFUL suggestions would be great:)! Thanks so much!