A recent study "Analyzing Personality through Social Media Profile Picture Choice", published in the AAAI (Association for the Advancement of Artificial Intelligence ) Digital Library, combined thousands of Twitter pictures with personality analyses
but .... unfortunately the Big Five normative personality test is obsolete, it has been proven as an incomplete and incorrect model of personality. The HEXACO (a.k.a. Big Six) is another oversimplification. Online Dating sites have very big databases, in the range of 20,000,000 (twenty million) profiles, so the Big Five model or the HEXACO model are not enough for predictive purposes. That is why I suggest the 16PF5 test instead and another method to calculate similarity.
The Big Five normative personality test is the biggest mistake Psychologists made since several years ago.
The Big Five is also known as the Five Factor Model theory of personality traits, a psychological model based on research by Paul Costa and Robert McCrae.
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All normative tests like Big Five, HEXACO, 16PF5 or similar like 15FQ+ to assess/measure personality should be used with the correct norm.
You should have the norm for each country where you operate
You should use the norm for each country where you operate.