What predicts attractiveness-enhancing behavior?

Such investigations are invariably somewhat speculative, but from some new research here goes:

The strongest predictor of attractiveness-enhancing behaviors was social media usage. Other predictors, in order of effect size, included adhering to traditional gender roles, residing in countries with less gender equality, considering oneself as highly attractive or, conversely, highly unattractive, TV watching time, higher socioeconomic status, right-wing political beliefs, a lower level of education, and personal individualistic attitudes.

That is from a paper by Marta Kowal, et.al.