Not only do we not all have the same skull shape but forensic people can build up flesh on a found skull to make an educated guess as to what the person looked like. There is statistical data for the thicknesses of tissue in different places that allows them to construct facial muscles, etc, then clothe that with skin.
Here ‘s an illustrated description of the process:-
https://naturalhistory.si.edu/education/teaching-resources/written-bone/forensic-anthropology/forensic-facial-reconstruction
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