I love working in photoshop and playing with layers and blending modes. I combined three photos for the final image. The first thing I do before I begin any type of photo manipulation is to create a copy image to work on so if I mess it up, I still have the original.
I removed the background behind before1 by using the magic wand tool for a large selection, deleted most of the background, then used the eraser tool to define the edges. There's probably better ways to remove a background, but I like doing detail work. After removing the background from before1, I inserted before2 photo under before1 in the layers palette, and then inserted before3 photo on top of before2. I set the blending mode on before3 to hard light, which visually merges the two layers so they look like one. I also did some shading with the burn tool to create shadows on before2 around the guy so the final image looks more realistic.