The snake schlong with a serpentine head is accurate, if not...erm...'standing to attention' as much as it should be (No blue pills were ever necessary for Pazuzu who was permenantly erect, thanks to him supposedly packing the power of the sun in his p***k).
Still, at least a 'softer' approach to Paz's appendage makes this picture from the (appalling) 'The Exorcist: The Beginning' look a little less awkward:
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Oh, is this just a shortened version of how it appeared on screen? I can't make it out perfectly in images because they tend to be fuzzy, but I always thought the snake was wrapped around the woodrow, not that it was a snake shlong