Percy jumps a little when he sees that glare, before he realises it's directed at the mirror, rather than him. He nudges her back softly. "I'm serious, you look great."

It's possible that he's not that most unbiased opinion here, because he would probably think she looked great in rags covered in monster gunk. But it's the thought that counts, right?

He's taller than her anyway, enough that he can still see the top of his head from behind her as she works her hair into a braid. He continues messing with his own, before tossing his hands in the air and giving up. "You'll still love me with bird's nest hair, right?" It's not that bad, but he's nervous.