noun
person who cares only about looks; being attracted only by appearance
Colloquial noun referring to a person who judges potential partners solely by physical appearance, or the trait itself. Often used in a mildly critical or teasing way.
彼は面食いだから、相手の顔で決める。
He's only into looks, so he decides based on the person's face.
面食いの友達に紹介するのは難しい
It's hard to introduce someone to a friend who only cares about appearance.
A more neutral, descriptive phrase meaning 'placing importance on appearance', not necessarily limited to romantic attraction.
Compound of 面 (めん, 'face') and 食い (くい, 'eating', from 食う), literally 'face-eating'. The exact origin is uncertain, but it figuratively describes someone who 'devours' or is fixated on good looks.