Like it was mentioned, there is no such thing a the worlds mot beautiful woman, because women featurs are always changing. For example I was at a event where there was nothing but fine ass Russian models and one was drunk as hell licking my neck and acting real slutty. To me she looked like your average slutty drunk white girl but she told me she was the biggest model in the joint. I did't pay he any mind and thought that was the liquor talking, but then when I checked out my pics I took of her I checked out her features and realized she was the baddest chick in the joint.
Another black chick looks fine as hell, and walking down the streets she looks like a dime. Phat ass cute face slime waist, the whole nine. But when she got in the studio and started posing her features does not translate well to photography at all.
Looks is like an illusion, some times the more you see a woman, the less she looks, other time its the direct opposite, some are good in print others in person.
With all of that, I say it is impossible to determine who is the best all of the time.