Photo forensics: Identifying faked pictures

Recently a family member sent me a set of pictures supposedly showing Mexican headstones with insulting epitaphs

In another case, the shadows in the deeply incised cross at the top show that the sun must have been high in the sky and directly in line with the gravestone. However, the shadow on the bottom left of the stone indicates that the original picture of the gravestone used in the photo-composition had a shadow cast from the sun off to the right of the stone.

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