Lots of American ones I would have included, but I can think of a few foreign ones that I would have picked long before most of those. Among those are Yeltsin standing on the tank during the Soviet coup attempt, the pictures of Neda Agha-Soltan dying after being shot by the Iranian paramilitary and any number of pictures of people escaping over the Berlin Wall (or even one of the shots of the Wall being torn down).
Far too many of the forty were people weeping at coffins or graves, and I think they lost some of their power from repetition. And three of the forty were dogs being reunited with their owners? Pick one (or none) and that opens up two more slots.
