Well, DrB...
I have to say that someone, somewhere, will give you a hundred reasons why the picture has a ghostly image. And it's easy for them, especially when they aren't there, haven't ever experienced anything remotely like it or, just like to de-bunk stuff rather than speculate on the possibilities.
There have been many, documented cases with physical evidence that strange things have happened to credible people. They can't all be liars, thrill seekers and wanna-be's for that 15 minutes of fame. Personally, I haven't had any type of encounters with entities from the other side*....but I'm not so dumb to challenge the 'Hereafter', appirations or beings trapped in between.
*Once, a very long time ago, and a bachelor at the time, I was walking down the hallway of my small (and very old) rental home. Something struck me in the back and as I turned around a penny hit the floor. Now, I was alone, nobody around...and it's something that truly did happen to me. It was very unsettling to me, but as time went by I explained it away as just a weird thing. But, decades later, I still vividly recall those few seconds...and never fully convinced myself that I was really alone.