Part 2 of Point of Contact (I know, I haven’t even begun drawing part 1 yet, after Christmas, I promise) has a scene in the oval office. There’s a White House photostream on Flickr, which will be good for detail reference and images of Barack Obama and Hilary Clinton to get a good likeness. Even better, there’s a section in the White House museum dedicated to 3d models of the building, key rooms and Air Force One and Marine One.