Cycles render engine has a powerful lighting system and this is a simple demonstration of what can be achieved.
Ace is right draw conclusion from the blend and not just the image all textures are packed including the girl in the pool she is not gimped or photoshoped into the final render she is part of the scene get the file and do the render.
Interesting observation Anuga, we should also be interested in what is behind the house or on the roof. As an artist you should love everything that saves your time.
DO A DIRECT RENDER MY FRIEND THE LADY IN THE POOL IS AN ALPHA CHANNEL TEXTURE THAT IS NOT PHOTOSHOP, I GOT THE BLEND YOU GET THE SAME IMAGE WHEN YOU RENDER THAT IS JUST THE POWER OF CYCLES NODES AND POST PROCESSING.