You know, I do not think it is necessarily looks, I do not think I am the prettiest girl... Everyone has something that is their asset, some have the hair, some have the cheekbones, others have the lips. But once you know what is your asset, then you should capitalize on it.
As an actor, you don't often get a chance to know exactly the impact of what the audience is seeing, even though you can ask where the frame is. A move that feels tiny can be huge, and vice versa.