import source image, crop it out using pen tool, and grayscale it to match the already black and white landscape. also scale it down to fit the surroundings
step 3 of 4
Added some grunge to the car to make it more desolated-ish. And also added shadow from where i want the light, and some grass brushes (built in with photoshop) to make the car blend in better
step 4 of 4
added a huge soft brush, and set the blend mode to screen, to create a realistic, still surrealistic feeling, which blends the landscape and car great together.
Also added a gradient map on top of everything for the final touch