What you think looks like leather, is actually just an emphasising effect of lighting and sharply detailed image. Your skin also looks like this if we use lighting and sharp focus to emphasise all the little details in your skin, the small hair, and the goose bumps, and the birthmarks and so on. If you look at this image of the same model, from the same shoot, but with different lighting, you can see the skin looks more healthy, because the imperfections aren't so visible: baineann.deviantart.com/art/Ge… .
True, but unless you've seen her medical records, spent sufficient time with her, or employed other means to acquire crucial context, you can't really say that about someone, except in extreme circumstances. After working with people who have been malnourished, I can safely say that this model is not an extreme case.
I know plenty of naturally skinny people, but they don't look like this.
my younger sister is incredibly thin, naturally. she never had a problem with weight but was still slightly dissatisfied with her body. it was images like this, images that send a message that you have to look like this to be beautiful, are what drove her over the edge from "fitness" to "eating disorder". sure, her sternocleidomastoid muscles were already sharply defined, and if she bent over there would have been little bit of spinal definition, but her hip bones didn't jut out like this. you couldn't count the individual vertebrae, or the various knobs on her illiac crest, and her skin was not stretched over her abdominal muscles like dried leather. even at the height of her battle with anorexia, when we had to call 911 because she passed out and fell down the stairs and her heart had stopped from how weak and malnourished her body was, she was not even close to being this skinny.
I know naturally skinny people, and they have looked like this. The beauty about the human body is that there is not definite image for it, and there is not one definite shape. I've met people who look like this who have been told they were healthy. And I've met people who are fat who have been told they are healthy (I am a fat schmo, and the docs say that I am currently at no health risk).
Also, nothing in this image suggests that you have to be like this to be beautiful.