That's great, because Photoshopping expertise is badly needed here. What I noticed is that the suspicious hand has a completely flat line of pixels, as if this was the margin that was copied and pasted. To a lesser extent the shoulder too. Is this a Photoshop edit?
From the grandfather's shoulder, I would expect that his hand was straight down, on the seat of the bench.
So, seeing his hand on the shoulder, makes me think it's a Fake.
Also, the hand is oddly hovering over Obama's shoulder. Weird. This makes me think it's a Fake.
However, the presence of the hand at all is completely optional. I would think that a good Photoshop artist would get rid of the hand entirely because it makes people think the photo is a Fake.
To a certain extent, in a perverse way, the fact that the hand is present, and weirdly hovering, makes me think that the photo is Real.
Unless the photoshop guy is playing a very deep double bluff game.
“What I noticed is that the suspicious hand has a completely flat line of pixels, as if this was the margin that was copied and pasted. To a lesser extent the shoulder too. Is this a Photoshop edit?”
It could be, but I would say it was very unlikely given the very real shadow on the shoulder. As I ran the gamma (think exposure) up and down the range, nothing jumped out as looking unnatural. Additional, odd and sometimes very straight lines do tend to appear on low res pictures.