Smile
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A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duche
Detail of the Mona Lisa, who is known for her smile
A smiling child
A sonriente ceramic figurine, 600 to 1000 CE, Classic Veracruz culture. Although their purpose is uncertain, the profusion of these smiling figurines is distinctive since depictions of such expressions are uncommon in other Mesoamerican cultures.
Smiling Girl, a Courtesan, Holding an Obscene Image (1625) by Gerard van Honthorst. Humor has been noted as a source of inspiration for many notable Dutch Golden Age painters.
Facial Action Coding System
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The Facial Action Coding System is a system to taxonomize human facial movements by their appearance on the face, based on a system originally developed by a Swedish anatomist named Carl-Herman Hjorts
Smile
…example, Barbary macaques demonstrate an open mouth display as a sign of playfulness, which likely has similar roots and purposes as the human smile. Facial Action Coding System Frown…
Muscles of head and neck