(Hero/Corbis ) When crow’s feet were present the smile was judged to be more authentic, intense, spontaneous and to convey more amusement.
Smile! Crow's Feet Make You Look Clever and More Attractive
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FEBRUARY 01, 2013
Fiona MacRael, Daily Mail

People are judged more attractive and more intelligent if their eyes wrinkle around the corners when they smile, research shows. Psychologists asked a group of men and women about their impressions of a set of photographs showing people smiling. In all cases, the corners of the mouth were turned up. Sometimes the eyes were also scrunched up – often thought to denote a genuine smile.
Read more: Daily Mail