"Smile?"
Either they didn't want to go to prom together at all or they weren't ready for the picture. Her dress looks like it's made of tissue paper her hair is, unfortunately, a mess. Not a lot going right for these two.
Take Your Brother To Prom?
These two look super close to being siblings. They could be, I guess that wouldn't be horribly weird. One looks way more excited about going to the dance than the other, though.