Why do people look differently other than skin pigmentation?

Question

such as shape of nose, facial structure, and shape and color of eyes.

Answer 1

Genetics mostly.

Also the area of the world they came from originally shows up as people of the years have adapted to the region they lived in.

Answer 2

Genetics,sometimes geographical,ethnicity.The skin pigment is called "melanin"from melacytes cells that are in the upper layers of normal skin.They multiply and decline affecting the color of skin,like a summer "tan" or winter" paleness" SW RNP