There's no rule to state that you must draw an object's shadow — if it is omitted, the result is a flat, graphic description. But the shadow cast by an object will help create a sense of context, framing its edges and grounding it within the surroundings. Shadows also set out new areas of space within the drawing — for example, the area beneath a table or an armchair.
A full range of tonal values, from clear, bright highlights to dense shadow, produces a drawing with plenty of surface interest and apparent depth. If tones are shifted toward the extremes the result is a high contrast drawing that has less surface detail, but more drama and power.
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