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Proko offers professional, paid drawing courses but there are enough free drawing tutorial videos on the site to warrant a mention on this list, and to recommend a visit. Proko represents a collection of artists headed up by Stan Prokopenko, an artist and teacher, who hosts many of the free videos. This site takes you from drawing basics, such as basic shading and three-dimensional effects, through figure drawing, portrait and head drawing, anatomy drawings, and caricatures. The videos are good quality and quite often start with a basic tutorial before going into more advanced techniques.