also: きめがお
noun
cool expression for a photo; posing face
Colloquial term for the deliberate, often cool or attractive facial expression someone makes when posing for a photo, especially in selfies or group shots.
写真を撮るとき、いつもキメ顔をしてしまう。
Whenever I take a photo, I end up making a cool expression.
彼女のキメ顔が決まってるね。
Her posing face is really on point, isn't it?
ドヤ顔 is a smug or self-satisfied expression, often used when someone is proud of something they did, while キメ顔 is a more general cool or attractive pose for photos.
Compound of キメ (from 決める, 'to decide' or 'to look cool') and 顔 (face). The katakana spelling キメ is common in colloquial usage.