(one's) face doesn't fit
One's physical appearance or behavior is not well-suited for a specific job or task. That girl's pretty enough, but her face just doesn't fit for a couture ad campaign. No, I don't like him for the role—his face just doesn't fit. He's too edgy to be our leading man. If you're going to pursue modeling as a career, get ready to hear things like, "Sorry, but your face just doesn't fit" over and over again.
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