I started with this image. You can see the steps to make this image here.
I took this photo of the interior of a ghost town building with my DSLR and did basic processing for explosure and shadows in Lightroom.
In iColorama I used Effect/Blend to blend the ghost town image onto the girl image. While in Effect/Blend, I used my fingers to move and resize the top image to get the composition I wanted. I tried many of the blending modes, and I used the gray slider in the Set panel to reveal only the parts of the girl image that I wanted, so I wouldn't have to do any masking.
This is the final image after finishing touches in iColorama for tone, color, sharpness.