When someone compliments you on your beauty, cuteness, or prettyness, accept and thank them. Accepting praises graciously offers additional opportunity to be appreciated. If it's from a stranger, a simple 'thank you' will enough. If it's from someone you know well, like a friend or family member, then "you're very welcome" is appropriate. Now that you know how to respond when someone tells you that you are beautiful, get out there and tell people often. The more we accept positive feedback about our looks, the more we'll encourage others to give it, which will only help boost your confidence in big ways.