Museum of Modern Art's learning page. A featured resource on MoMA Learning is this video containing five tips for teaching with works of art. The video not only lists the tips, it contains examples of using these tips to teach art history and art appreciation lessons to students. The video is embedded below.
One of the other excellent resources on MoMA Learning is this glossary of art terms. In many cases the definitions in the glossary contain links to multiple examples of each term.