I think the way you treat others has a major impact on how others see you. You can be the most beautiful person in the world but if you put ugliness into the world then that reflects poorly on you. If you treat people with kindness and respect then I believe that makes you a very lovely person.
Honestly, the first thing that makes someone beautiful is how they look, how they manage to present themselves. It's good to look beautiful but it's important to be good. This is something that makes us beautiful.
I think being kind, smiling, and putting an effort into my appearance, even if it is just basic grooming such as brushing my hair and teeth and splashing water. People appear only as beautiful on the outside as they are on the inside.