When did smiling for the camera become a thing?

When did it become the standard to smile for the camera? How did it become the standard? And does this vary by culture?

DeWayfarer · 61-69, M Best Comment

Probably far older than photography. Leonardo Da Vinci's Mona Lisa (1503 - 1519) is famous for her smile and even then it's likely far older.

DeWayfarer · 61-69, M

@KeepYourEyesPeeled Thank you for the BC.

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