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/

Presumably, everything you have done publicly (and hence your personality) exists somewhere in the big Google neural network. It gets compressed into one of the many billion weights. It might be hard to decompress it into useful information. But it is there nonetheless. Just showing your face might trigger and activate some layers in there.

Just my hypothesis.

> politically aligned with the Democratic party

That's sometimes possible (e.g. the "Trump woman" look, or certain "I know it when I see it" stylistic cues mainly displayed by progressive women that I can't really articulate). Polarization has turned political alignment into subculture, and members of subcultures often dress certain ways (and not necessarily consciously).