Why humans evolved a diversity of facial features:
Before they were human (individual or communicative), individuals somehow decided (communicated) to develop these traits, and this decision drove evolution.
Really? NO!
Humans evolved facial features (beginning as simians) as random mutations and THEN (meaning afterward) this contributed to becomming human.
We do not have facial features because we are human, we are human (very partially) because we have facial features. This is a cause-effect reversal.
Please do not be insulted. Even evolutionary biologists, who should know better, state the cause and effect of evolution as if a deity "designed" all life forms.