See the post for full details.
My friend Tom sent me a link to Darren Rowse's blog post on Ben Heine's work. Ben Heine creates pencil drawings which he overlays onto scenes that he is photographing—i.e., he holds his drawing in front of the scene. The resultant composite is really not only clever but stunning. I recommend that you go and look at the post to see images, an animation of the process, and learn more about Ben Heine.