This is a great shot by Italian photographer Ilaria Cerutti. First of all, I love the framing and how it has removed the people's heads to make this shot anonymous. This composition makes you wonder who these people are, and where they are sunbathing. I also like the use of contrast in the image to really make the people stand out. A great shot, one which most photographers probably wouldn't consider.
Ilaria is a very talented photographer who produces some fantastic images, from suggestive landscapes to the more abstract. Please use the link above to view this image on 500px and take the time to browse through the rest of her work. You won't regret it.