Web Gallery of Art, image collection, virtual museum and searchable database of European fine arts (painting, sculpture) of the Gothic, Renaissance, Baroque, Neoclassicism and Romanticism periods (1100-1850), containing over 17.100 reproductions. Biographies, commentaries, guided tours, free postcard service are available.
The Digital Photography School blog has an instructive tutorial on using layers for those just getting their feet wet inside Photoshop, or other high-end image editors like the open-source
Drawspace.com offers diverse downloadable and printable drawing lessons featuring Brenda Hoddinott's unique and highly acclaimed style of teaching. Brenda is the author of The Complete Idiot’s Guide to Drawing People, and Drawing for Dummies.