Well this was kind of an expiriment. I wanted to make this look like a stock. So I payed the most attention to the blending of the render.
I didn't create much effects as you can see. The guy in the front is a render. The background is just a stock altough I changed some things in the background but oh well.
BG stock:
http://i42.tinypic.com/2uop2lh.jpg
render:
http://i39.tinypic.com/10h9577.png