I’ve just uploaded my latest free online video tutorial: Masterclass. Its a shoe still life oil painting (see image below) that I did for the 2011 Footlocker Art Prize. I've created a free time lapse video tutorial of the painting from start to finish and experiment around with oil paints in a commercial airbrush.
P.S. While I know this is not strictly 3D, basic elements of composition, colour and "art" apply (and I get a lot of feedback from people from this site - greatly appreciated!)