Genes, by themselves, can't determine anything Twin studies partition the variance in nature and the variance in nurture.
When a woman is putting God first in her life and is striving to do what He has commanded, she is attractive to God.
That's like saying that water has no influence on a fish's development because all fish live in water.
A person can be beautiful just from the way they act towards others or the way they go about their daily lives.
It comes from the right combination of personality, confidence, and of course physical attraction.
God also values a woman who fears Him.