Clear and concise tutorials that don't assume the viewer is a seasoned artist. The best videos I found today for example, on just learning facial proportions was fantastic, since it just confirmed what I already knew about eye width, nose width, and all of that stuff. Another video showed a drawing of a face being made using 'classical proportions', and went through the entire process of the drawing being made roughly, and then being perfected, and blocked in with shading, all done using a pencil.
Fantastic.
I suppose for myself, it's actually harder and easier to learn by observation and doing it myself, than relying on another artist's tutorials. Alot of those I have seen are way too technical, and not gearing towards an inexperienced viewer, thus they're too complicated to understand and to follow.
~ Pyre