Definitely a supernatural manifestation : )
My question would be, did Schott see this photo and then do the drawing, or did someone see Schott's drawing and then mess with the old photo in photoshop. The head just above the guitar is very werewolf-ish. He's licking the guitar, with his long tongue. In the very upper right there is another demon of more lizard-ish persuasion. Reminds me of Heironyus (sp.)Whatsisname, the medieval painter.