Why Runway Models Don't Smile - FASHION Magazine
The original purpose of runway models was to replicate the demeanor of actual mannequins, hence why blank expressions trumped smiling faces.
Supermodel - Wikipedia
To Smile or Not To Smile on the Runway? - John Casablancas
Why runway models don't smile on the catwalk
Is there a reason fashion models don't smile while modeling a cloth? - Quora
Major mystery decoded: Here's why supermodels never smile ever
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Why fashion models don't smile
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Why Fashion Models (and Some Celebs) Don't Smile