It's very simple. The girls who've come here when they were very young have grown up with American superficial lifestyle as they went to school with other American children. They have mastered the art of MAKEUP by the time they are 18. Another reason is the dress up too. Most likely your appreciation of beauty has been affected by the hours you spend on TV. While an American raised girl gets a first hand impression of what to dress, a girl raised in Nepal gets her sense of fashion and dressup first through Nepali society and TV which copies from Indian TV which in turn copies from the US.

I hope you can put your query to rest and move on from there.