Do you try to encourage your children to appreciate art through sculpture and pictures in art galleries?
Certainly Yes, and with the proper storytelling by my wife or myself, they can come to like it, or even love it. At some point my eldest daughter (she's six now), wouldn't leave some museums.
We come from Spain and our kids are very used to art and museums, all over Spain, rest of Europe, and some here in the US.
It also depends a lot on the kind of art, they'll rather prefer modern, and the museum itself. It may include activities for the children, which facilitate the task as well.