I have used this artist database as a research tool for years and I find to be incredibly valuable. This past year I had my students create a google slide presentation on the elements and principles of design. They were required to pair one element (Line, Shape, Form, Color, etc…)  and one principle (Harmony, Contrast, Balance, Emphasis, etc…), then find an artwork that demonstrated that pairing. Students were also to include a 50-word explanation of how the artist incorporated the element to create the visual principle. This website can also be used for inspiration, technique examples or compare and contrast assignments. There is a wonderful range of artwork on this site and in addition to the images the site host art conferences and panel discussions as well. Well worth an exploration.