There is a general consensus in China that the girls in Sichuan province are the prettiest. There is even an old saying “You’d better not go to Sichuan; it wouldn't help your career”. I went to Sichuan, twice, but the girls there looked the same as the girls from other parts of China. Maybe all the Chinese people look the same to me?
Whether the girls from Sichuan are the prettiest or not, it is always useful to learn how to say you are pretty in Chinese language. Below are the different ways you can tell a girl that she is pretty:
你很漂亮(Nǐ hěn piàoliang): You are beautiful
你很可爱(Nǐ hěn kěài): You are cute
你很好看(Nǐ hěn hǎokàn): You are good looking
你很美丽(Nǐ hěn měilì): You are beautiful
Remember the 美 (měi) from “Beautiful Kingdom?”
If you want to say the same to a guy, use the following
你很帅(Nǐ hěn shuài): You are handsome
And if you think someone is ugly
你很丑(Nǐ hěn chǒu): You are ugly