Not an expert but... First guess is that facial symmetry is a proxy for social intelligence which is easily 75% - 50% of what your brain is working on during t

Not an expert but... First guess is that facial symmetry is a proxy for social intelligence which is easily 75% - 50% of what your brain is working on during the day. However if my guess is warranted then it shall be incorrect for some men with non-symmetrical faces because many generals, politicians aren't that attractive but definitely of superior intelligence. A way to test my hypothesis is to separate the men from the women. Evolution plays looser with men than women. The machine learning should be more accurate for the women. All this may be bollocks.