When you are drawing it’s very easy to get so caught up in trying to render what you see in terms of angle and proportion that you forget about the power of line. If you look at drawings done by the Old Masters and other artists, the line of the pencil is in constant movement and change – thick, thin, light, dark, solid, broken, repetitive... Take a moment to look at some Old Master drawings and notice how the different line styles give you different types of information and create interest. A contour line that breaks might suggest light hitting that particular spot.