I love seeing random examples of excellent bone structure versus weak bone structure, either photographic or in real life. I never used to notice this stuff before taking an interest in orthotropics and the like. Now I can formulate in words exactly what it is I find aesthetic in some people and less aesthetic in others. Before I'd only have a vague sense of "A looks better than B" without being able to put my finger on it. 

Take this random old photo I came across. It's an excellent example of weak/mediocre bone structure set against very good bone structure. While the woman on the left is certainly pretty when viewed in isolation, the woman on the right just looks so much more beautiful and confident. Even though her face has slightly masculine traits. Everything about her screams "great genes" and it's all down to the sturdiness of the bones in her face.