Fine & Performing Arts: --- for Fine Arts
An industry standard for information catalogers and researchers, the Getty vocabularies are intended to provide terminology and other information about the objects, artists, concepts, and places important to various disciplines that specialize in art, architecture, and material culture.
Research Guides & Resources from Other Institutions
Google Art Project
Never underestimate the power of Google...
Digital Collections & Online Galleries
Almost all major museums and archives in the world now have an online catalogs containing digital images of physical works in the collection of the institution. These catalogs can generally be accessed through the museum's website. They searchable in the same way that textual databases are searchable, and they provide detailed information about key art objects. Some of my favorite examples are as follows: