First, your face has changed over the past 10 years because of the aging, the way you take care of your face, your health, your mental and emotional state, your

First, your face has changed over the past 10 years because of the aging, the way you take care of your face, your health, your mental and emotional state, your sleep, your nutrition, and many other factors. Second, the model in the paper did not only look at the face, but at the entire photograph. How you choose to present yourself on a dating site has also changed over the 10 years: the quality of the photo, what haircut you choose, how closely you shave, whether you're tanned, your facial expression, whether you wear glasses, what objects, landscapes, and colors can be seen in the background, etc. Finally, and most importantly: Even if your dating site profile picture hasn't changed in lockstep with your political leanings, that's fine -- they can make some errors and still get the 72% accuracy they report.