My explanation ---get ready for this--- is that it's a living human's face. I think it's conceivable that Niamh is having us on, or that it's someone she doesn't recognize, or that it's a reflection of someone's face. Aren't all of these more likely than that the face is a disembodied spirit, mugging from the great beyond?
Janine didn't do us the courtesy of posting the picture she considers so otherworldly, but the principle is the same. She, too, could be having us on. Maybe her son is better at Photoshop than she realizes. Not having seen the face, I can't even say it looks like a face. If it does, maybe there really was a person outside the window, or it was a reflection of someone inside the room. Sound farfetched? Well, once again, how farfetched is it to believe it was the face of a ghost peering at the camera through a supernatural portal?
I'm not trying to be insulting. I'm just trying to show that there's a way to play the odds when we're dealing with questions like these.
Regards,
Istvan

