noun
triumphant look; proud face
Describes a facial expression showing pride or satisfaction, often after a success or when feeling superior.
彼はテストで満点を取って、得意顔を見せた。
He got a perfect score on the test and showed a triumphant look.
妹は新しいドレスを着て得意顔で立っていた。
My younger sister stood there with a proud look, wearing her new dress.
ドヤ顔 is a slang term for a smug, self-satisfied face, often used in casual or humorous contexts. 得意顔 is more neutral and can be used in both casual and formal situations.
Compound of 得意 (とくい, 'pride; satisfaction') and 顔 (かお, 'face'). The reading がお is a rendaku form of かお.