Give some examples
Glad you asked.
There are skull shapes and facial features among people.
Somalis tend to have a Caucasoid (coincidence, we're not the same race) skull shape.
This is characterized as oval and narrow. Also we have smaller noses and Fuller lips.
Taking this as an average model, we need to be real with ourselves when it comes to aesthetics.
A person from a race with a wider skull will not work.
Why?
Because it will definitely not work well with thin features in the face.
You could straight up look like Humpty Dumpty
Now if you get their nose and narrower eyes with a medium skull shape and a somewhat smaller forehead, that could be the golden combination.
However, that's just too damn risky.
Also, don't get me started on height.