Without any offense to you, the creator of this app. It's obvious a lot of care went into it and you wanted to create a better product than what is out there. Even considering the mental impact such ranking could have.
However, I genuinely feel that the need for this app is what's wrong with society.
I personally would prefer a randomly selected load of strangers to vote on, say, my best corporate headshot to display to the general public rather than my friends who are a small and biased group.
I guess the people that self-select to go on a photo ranking site may not be representative of the general public, though are probably better than the (all male) 10ish engineers and 3 accountants that I socialize with on a regular basis.
No offense taken, I also have many qualms about the role looks and photos play in our society. The destruction & gamification of social interaction by tech is a genuine harm.
Unfortunately it's what we're dealing with right now, and people need feedback to be able to play the game.
However, I genuinely feel that the need for this app is what's wrong with society.