Mason: Face Sculpture Study-After:
National Gallery of Art (search collection for "bust")
Emerson: Spanish Artists
Artcyclopedia: Artists by Nationality
General Art Links:
Heilbrunn Timeline of Art History (citations provided!)
Museum of Contemporary Art (post 1945 painting, sculpture, photography, video, film and performance art)
Smithsonian American Art Museum
The National Gallery in London
Rijksmuseum (Dutch masters)
Museu Calouste Gulbenkian (Egyptian, Greco-Roman, Eastern Islamic, Mesopotamian, Far Easter & Armenian)
Whitney Museum of American Art - (Works in all mediums—painting, sculpture, drawing, printmaking, photography, film, video, installation, and new media—serve as a remarkable resource for understanding art history and the creative process of artists in the United States from 1900 to today.)