Could this be an apparition in the window of Owlpen Manor?  Take a closer look in the window and be sure to see the full size .pdf file of the original image.  It is much more clear:

"If you look into the window in the attic room, you should be able to make out the shape of a person, you can see the face and hands, they appear to be dressed in what look like a long white robe, well as far as you can see.  You can see a face, appears to be roundish with short dark hair, the expression on the face, which is somewhat transparent and seems to one of sadness.  This picture was taken in the early hours of the morning, around 6:30 AM.  I just happened to see something from the corner of my eye and took a snapshot."