The Big Five personality traits, also known as the OCEAN model, is a grouping for personality traits that is divided into five factors: Openness to experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. These traits are mostly stable for adults, and there have been works studying the relationship between these factors and areas such as personal values, political attitudes, and academic achievement.
While there have been studies trying to predict the Big Five scores from sources other than self-reports (such as from behavior at social networks or from smartphone data), it is possible that in the future these scores could be somewhat accurately predicted from photos, in the manner that now facial recognition technology can expose political orientation.