Hi, Sarah. As an artist, I can tell you that we appreciate your patronage. To answer your question, it depends on the piece. If it's already a famous piece, you have one set of options. If it's privately owned, you have another option. If it's not commercial, you may have to work to get it.
What is the piece, and do you have a version to show me? Who is the artist? When was it done?
Bei