When a beautiful woman smiles its amazing. Their smiles seem all encompassing, mouth, smiles, posture facial expression. It reflects deep happiness and she's willing to share that feeling with her smile. They beam and you can't help to feel the same way.
The sad part is when they are with a less attractive woman. She might be heavy or plain and sometimes she almost seems surprised if you say hi when you are passing. Sometimes on a trail I will smile in the direction of the less attractive one first because she is probably not used to it. The less attractive will smile back but it more with just her mouth.
The beautiful one seems to expect to be appreciated and is used to and enjoys the interaction. Too bad the less attractive one can't experience that.