If you believe this study [1], humans can guess party affiliation at least slightly better than random chance from images alone.

Or [2] is an (unscientific) exploration from the other direction, prompting image generation models to make images of republican and democrat voters, with very different results

1: https://pmc.ncbi.nlm.nih.gov/articles/PMC2807452/

2. https://rooftopsquad.com/democrat-vs-republican-faces/