My God, Trip is a spitting image of G.W. Braindead on that pic!
Flipped heads on a body from another image perhaps? People aren't perfectly symmetrical, so you can generally tell when the image is a mirror version. The artist needed a shot of Trip looking in a particular direction and cheated a bit, I'd imagine.
All sorts of tricks are employed in the world of media and advertising. You only have to look at various magazines, which slim and tweek the female form.