What is there to "prove"?

You think the Girl 4 is "butt-ugly."  Well, that's your opinion and you're perfectly entitled to it--

But that doesn't mean you're "right."  Or "wrong."  It's just your opinion. 

If you don't like Girl 4, you don't have to buy her or use her or have anything at all to do with her.  So what is your problem?  It's not as though anyone is pointing a gun at your head and forcing you to use the model.