Images organized by the type of Creative Commons license held by each image
Google Image SearchGoogle has always been a great way to find images. Results are thumbnails of the images, allowing you to sort through them quickly. Use the limits on your result list to get better results. Change usage rights to "free to use and share"
Web Gallery of ArtThe Web Gallery of Art is a virtual museum and searchable database of European painting and sculpture of the Romanesque, Gothic, Renaissance, Baroque, Neoclassicism, Romanticism periods (1000-1850), currently containing over 28.400 reproductions. Picture commentaries, artist biographies are available. Guided tours, period music, catalogue, free postcard and other services are provided.