On the left, look what Trump is doing. To get his hand in position to support Merkel, he has got his elbow bent, to about 90 degrees, and he's got his wrist laterally bent towards her. That's it. That's all he's doing, and that's all he can do. Your joints move how they move, and that's how they move. But on Leavelle on the right, it is much different. He just looks like he's got a withered arm on that side, like maybe he had polio when he was a kid (although polio more often affected the legs than the arms). His elbow isn't bent like Trump's. He could not possibly be doing that. He could only do what Trump is doing. That piece of his forearm and his hand were added to the photo. And while you're at it, look at Oswald's hands. You can see how small his left thumb was. It wasn't humongous like this:
They must have had it set up that all images had to go through the FBI before they could be published, since this was a matter of national security. And even though in connection with how the events unfolded that weekend, we have never heard anything about the CIA being involved (when have you ever heard anything about CIA Agent So-and-So doing such-and-such that weekend?) the CIA must have had a photo alteration team- the most advanced and sophisticated in the world- there working on photos (probably at Jaggars-Chiles-Stovall photo lab, where Oswald used to work) working on photos as they came in like an emergency surgical team close to front line. You might call them a photographic MASH unit- but without the funny guys.