Values are critical in creating dynamic graphite drawings, as they help produce the illusion of the 3rd dimension on a 2-dimensional surface. It's one of the most important skills to learn as a realistic pencil artist to bring your drawings to life!
What are values? They are the degrees of lightness and darkness in your drawing.
When you see an egret in nature you know they are white, but they also contain a number of subtle value changes created by the sun and shadows. It's also necessary to understand the light source, taking into consideration what direction the light falls upon the egret because values change according to it's orientation to the light.
Drawing is all about being a sensitive observer. At times values can be very misleading. they can create an optical illusion to an untrained eye. But when you have mastered the value scale and incorporated it into your drawing, your work will be a ginormous success!