Nice idea, and I'm sure the Argentinian beaches are very beautiful.
While I like the way the models hair is being blown in the wind, I'm not sure about the grey(ish) skies or the rough seas . . They would be better on, say a windsurfing advert. I'm also not sure what the bottle she is carrying is for or where it comes into the advert.
I really like the beach scenary. But im not really thinking that this is a picture that would make a lot of people want to come. I know i dont like seeing a big butt when I think about the beach.