Pro-tip for non-photogenic people: You'll look better in a group photo than on your own. This is known as the Cheerleader Effect, and it's been scientifically verified.
In 2003, scientific evidence of the cheerleader effect was published in a paper
where across five studies, both males and females were rated more attractive when presented as part of a group photo compared to a solo photo. The authors, Drew Walker and Edward Vul, presented 130 participants with group photographs containing three female faces or three male faces. Each face was then cropped from the photograph and presented individually.
Participants rated the attractiveness of faces presented in a group and individually. Regardless of gender, attractiveness ratings were higher when people were presented in a group compared to presented individually.
However, this does not mean the bigger the group—the more attractive you are. The authors found that group size, whether 4, 9, or 16 individuals, had no effect on attractiveness ratings. Basically, a handful of friends is all you need to take advantage of this effect.
Importantly, studies have shown the cheerleader effect to be reliable. Additional studies published in 2015
and one just this month
continue to find a groups' attractiveness is significantly higher than the attractiveness of an individual group member.