Faces and Beauty

I'm not sure why I've developed an interest in this. It seems frivolous on the one hand and important on the other. Why are some people considered beautiful and some aren't? Frivolous, of course, since there are a lot of other much more important things to be interested in. Important since scientific studies show that good looking people - especially REALLY good looking people are treated far better by others that even nice looking people. But what is good looking or beauty anyway. What makes Brad Pitt a heart stopper as well as Russell Crowe. Weird. Julia Roberts is beautiful but her nose is all wrong. Just about the time I started staring at faces trying to figure it out, I saw a program on tv that said a plastic surgeon had figured it out. The eyebrows have to be a certain distance from the eyes, the eyes have to be a certain distance apart, etc. etc. etc. But the thing is all three of the Playboy girls have identical bodies and features but one of them seems to me to be more beautiful than the others. What's that about?