Open the hood

Both images: Jose Saenz

www.flickr.com/photos/30396144@N06/2936122381/in/set-7215...

www.flickr.com/photos/30396144@N06/2936120935/in/set-7215...

 

Transformations:

Color adjustment via curves

Layered the engine image over the car

Skewed & scaled the engine

Set transparency on the engine image

Erased the shadow of the tripod, tire marks, and dirt on cement via Clone Stamp

Scaled the image down to 1280x960

Done