I don't think I'm being picky when I say "redefine" isn't really what they're doing here. They're not redefining beauty, they are recognizing the beauty that is already in them. They are stopping for a moment in time to really see themselves, and to allow others to see them, without pretending to be someone else or trying to look like someone else, and they are seeing the beauty that's really there - not the "beauty" that is a result of trying to look like someone you're not. But I guess if a person's definition of beauty is "looking like someone else who is beautiful", then maybe this is redefining that for them. Personally, I think that if you look long enough and closely enough at anyone, you will see their beauty.