This is so difficult to say, I don't even know where to start. It's all about a combination of looks and character/personality. Allthough I do believe character/personality is slightly more important than looks, you still have to be physically attracted to someone.
I used to date very different girls character and looks-wise, so I really can't tell what I think is ideal beauty or what a girl have to be like to be liked... Allthough they all tend to be the wilder type who enjoy life and are more or less easy going(in a good way that is not a sl^&^#). I really can't stand drama-queens with an attitude...