"Scribbling"

The scribbling technique consists of random, free-form marks, made generally without lifting the pen. With consistent layers of this technique, it is used to create form and texture. to begin a drawing using this technique, you create a rough sketch with some detail. the rough sketch should be very lightly drawn.

As you can see, I began with a rough sketch that consisted of very little detail but included the general shape of the drawing.
Next you start to draw loose scribbles to begin to color in the drawing, give it form/texture, and give more detail. These loose scribbles begin to fill in the areas that you intend to darken later and it will initiate the greater detail that you will later incorporate. This initial scribble is known as a wire frame as it resembles the look of wire.

After you have finished your wire frame, you should then begin to truly develop the form by building on the wire frame layer. You do this by, "moving continuously around the figures to deepen layers and solidify forms." (pg. 139)

After you have included all the details that are needed, you can then move on to other aspects of the drawing that may include other techniques such as this one. the shadow in this drawing will consist of hatching.