man in tree?

by Derek Heeps
(Ballymena, Northern Ireland)

Hi, I am baffled by this picture I took whilst out walking my dog in Randalstown forest, Country Antrim, Northern Ireland. I took it with a new digital camera on 3/12/08. A face of a man can clearly be seen in the upper left hand corner in the tree. I have zoomed in and cannot explain it by any other means.
I would love to have your thoughts!

Thank you, Derek Heeps