It is a big warm captivating image that makes the viewer think they have inspired an awesome transition in mood. Culturally we fake this image and replicate it in magazines but it also exists in its real form. People want desperately to exude confidence and inner strength because it gets other people excited and has an inspiring effect. Younger people often have more inner beauty by virtue of their optimism, though many are equally pessimistic. Beauty in this instance is meant more as attractiveness.
Inner beauty can of course also be more personal.
You see something in someone else that reflects some quality of their soul. The eyes are usually the main channel by which we recognise this. The eyes reveal passion, sadness, melancholy, contemplativeness, coyness, intelligence, dedication, nurturing, etc. As people become older they are generally worn down by life and they learn to hide their emotions too. Many people have dead eyes.