affected look; made-up face
Refers to a facial expression that is deliberately put on, often insincere or artificial, like a forced smile or a contrived expression.
She smiled with an affected look, but her eyes weren't smiling.
Whenever I have my picture taken, I always end up with a forced expression.
Compound of 作り (tsukuri, 'making' or 'made') and 顔 (kao, 'face'), literally 'made face'.