This image is based on a picture of a project that I spotted on archdaily : http://www.archdaily.com/229583/swimming-pools-for-vigo-university-francisco-mangado/
I wanted to practice photo-realistic rendering with everything made in 3D. I modeled the vegetation by hand and spread it using the multiscatter plugin. Only the guy with its umbrella is photoshopped. I though it would be fun to make the piece with a bad weather instead of the standard blue sky.