You can tell from the pixels

maybe the blatant smudge tool used only in those last 3 panels all around the cardboard used to discolor everything but the edges of the cardboard, and around the hands, a feature that's lacking in all the other panels?

unless those 3 panels of cardboard just happened to get left outside and soaked in dirty rain, except the edges which were protected by Jesus himself.

They didn't even try to make it look realistic when editing.

• letters are horizontal, the cardboard not
• perfect font instead of handwritten
• different blur and compression than the rest of the image