This stunt actually breaks down the notion of it being solely defined by "supermodel looks" or the like. And when you are laden with a constant message that having "supermodel looks" is the one and only standard of beauty, that any other notion of beauty is wholly invalid, that any deviation from "supermodel looks" is wrong, inferior, ugly, undesirable... a reaffirmation that that standard is false is pretty powerful.
And even if one constrains it to physicality, the difference between thinking of yourself as beautiful and not is staggering, and can have a huge impact on the rest of your life.
Personal experience: About ten years ago, I suffered a dog attack. A rescued "bait dog" I was caring for got spooked and bit my face. I had to go in for reconstructive surgery to get the left side of my nose re-attached. Some pieces were missing, so they had to graft skin and cartilage from my ear. The surgeon did a good job, and apparently most people can't notice until i point it out. But i noticed. Oh boy did i notice. This (thankfully) relatively minor deformation to my nose actually sent me into a pretty deep depression and identity crisis for almost three years. I was convinced i looked like Frankenstein's monster or something. I lost almost all of my self-confidence, retreated from work and friends,. and was basically a total wreck, because of self-inflicted damage to my perception of myself.
I can only imagine what it must be like to have this same message thrown at you from birth, by an entire culture. The self-doubt and low perception of one's own worth it causes must be absolutely enormous.
Me, I got out of it. I came to terms, and forget about it until the weather gets cold. But women and girls, they have this same stream of doubt and denigration - that their bodies are all that matter AND that hteir bodies are "sub-standard" - thrown at them 24/7, from all angles, all their lives.
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