How often have I heard students say, "If I could just watch that man work, I'm sure I could get ahead!" Getting ahead does not happen that way. The only mystery, if such it may be called, is the personal interpretation of the individual artist. He himself probably does not known his own "secret." Fundamentals you must master, but you can never do so by watching another man paint. You have to reason them out for yourself. -Andrew Loomis
This sums up a lot of DVDs/workshops/videos I've seen.