I hate to say that, while all the dimensions and angles provide completely realistic possibilities, a lot of those look very fake. This one, I think, is a painting of a pencil and not a real piece of wood at all. The hammer is a different color than the graphite below it.
i don't find any difference in this one compared to others.. they are all fake or all real.. and with the link to the actual artist i would have to say they are most likely authentic.. but i don't blame you for being skeptical.. it is too far out to me too..