OK, couldn't see it yesterday, but it just jumped out at me. I think I see what DD's referring to. The eye is the darker spot just above and to the left of Adam's heel. The top of the head is at Adam's heel and the nose is pointing toward Adam's elbow. I see it very clearly.
I'm not saying it's intentional, but I'm open to the possibility that it is. And to all the lurkers, I'm level-headed and reasonable and educated, and I have a healthy dose of skepticism. But I will remain open. Why is it so hard to believe that some rogue in the art department might be just playing around?