This one is one of our favorites!
 
In this 30 minute demonstration, Peggi explains and shows you step-by-step how to begin and stay on track to get the most out of the lesson. You begin with the drawing and then do a block-in of the shadow mass. By keeping the shadow mass no darker than a value of 5 on a scale of 1 to 10,  this forces you to keep the remaining masses lighter and in proper relation to the value of  the shadow mass. Like music and playing a chord in the lower, middle or higher octave, the relationships stay the same. Think of the value scale as a keyboard of 10 notes.