The writing is really nice! I especially like the "what would we see if it was only distorted standards of beauty" bit, although it does seem plausible that the media interacts with our judgments to some extent. The structure of the middle is a little murky to me - if I was rewriting it, I'd condense both "reasons you mostly pay attention to your flaws" into one section and tie loss aversion into an overarching negativity bias more explicitly, then spend a little more time on attentional bias / availability bias.

I really like the message that we commonly misjudge ourselves, and need to try to learn to see ourselves as others see us.