The ear is a complicated arrangement of ripples and folds of flesh.

You need to organise its irregular shape into some basic forms that are easier to outline.

You can then use this linear framework to gradually build up its complex form with tone.

Look deeply into each area of tone and try to pick up on the subtle variations that lie within.

You may have to darken some of the light areas and lighten some of the dark areas to achieve a balance of tone.

Tonal drawing is simply a balancing act between the elements of light and shade.

In fact, all drawing is a constant balance between your observation, your concentration, your judgement and your technique.