I would think that if you took the pictures yourself, then the copyright is yours, and bear in mind that the ECN server is located in Long Island, N.Y., so is under U.S. law.
European laws can be weird though (from our Anglo-American perspective), so I wouldn't like to say for sure. A couple of people have recently fallen foul of the fact that Austria does not have freedom of speech, so copyright could easily be a minefield there as well.
Add that you took the pictures in a third country, and who knows? I wouldn't have thought the museum would object though, especially if the proprietor invited you to take photos.
