Rule of anime character's face

Allmost all character's eyes are very big.

-----my science teacher said 'the Ratio of eyes and face is very odd'

allmost all main character's hair color is not black hair

Sexy character has a mole under the eye.

character's moms are very young even if thier age is over 40. they often look like around 30

main characters are handsome or cute

chracter of rich person is handsome or pyknic type or conceit boy

character of long hair women has very long hair.

------- how do they wash thier hair?

Main chracter are not fat.