I think it is not about the model, but about the picture and how it was taken.
Model 1 : Eyes are wide open, long eyelashes. Lipstick in bright colour and blush makeup. Mouth is slightly open.
Model 2 : Eyes not fully open. Mouth closed with the ends of the mouth downwards.
Composition and probably purpose of both pictures is completely different, there for reactions of people watching are going to be different.
It might in fact be the same girl in different compositions although that would be an error of the photographer for his website.
About sexy or ugly I will not make a comment... girls are too young.
