Photo recreation
 

I saw a photo like this somewhere, may have been on this board. I wanted to recreate it because it was such a neat image. I used F22 and still couldn't get enough depth of field...but it came out OK

http://i621.photobucket.com/albums/t...psjugf5x0u.jpg

With that kind of distance, it is most likely a composite.
Even with f22 (f16 in that pic) - the distance between the model and the camera is massively different than the car to camera. Try a longer lens - 100, 200mm, with the mini car farther from the camera.