It's part clothing, and for men different facial hair, and for women far less/different makeup, and the fact that the picture is black and white and grainy has

It's part clothing, and for men different facial hair, and for women far less/different makeup, and the fact that the picture is black and white and grainy has a bit of an effect too. Also different attitudes and culture - it affects how they stand and walk, and even probably to a certain extent facial expressions are expressed more often than others.