Question

You are visiting a museum, and you want to take some photographs inside it. What should you do? You have a photograph that you'd like to sell. What should you do? You find a picture online that you'd like to post on your Facebook wall. What should you do?

Answer 1

At a museum photos aren't allowed usually but you can always see if you could purchase a print of the art you liked.
To sell or post a photo always credit who's it is.