If I recall correctly, I heard about this photo several years ago from Darkness Radio and Coast to Coast am. Think it was the presenters friend who captured this strange looking figure.
Apart from it being a small gathering at a camp side in the U.S and the photographer was taking a shot of some of the people around the campfire. The figure wasn't noticed until looking through the photos taken that night.
It looks as though it is wearing face paint/or seems like it is decomposing and a veil. Maybe some sort of Shaman? It does seem very out of place and you can see the glow of the campfire on the figure too.