I sent the picture to a friend who is a truly skeptic. I didn't say anything to him about the context of the picture, just asked him what he saw. He says that he doesn't see anything, but he did provide a contrast enhanced version that doesn't make me feel any less weird about this picture.
You can still very clearly see the features of the face... and a second face. Can't see it? Look again.
"Life's but a walking shadow, a poor player that struts and frets his hour upon the stage and then is heard no more. It is a tale told by an idiot, full of sound and fury, signifying nothing."