So, Henri Matisse is usually the go to man for contour line practice in these types of textbooks. On the left is his Three Quarter Nude Head Partly Showing (1913). It shows the contour line forms overlapping and moving towards and away from the viewer. In this case the three dimensionality illusion is communicated by occasionally leaving gaps between the lines, changing the weight of the line (heavy and light strokes) and controlling where the line starts and stops.
On the right is an exercise from Bert Dodson's Keys to Drawing of copying a master's style and work (in this case Matisse) to get a feel for the simple linear style or contour line style that he uses. His line work is simple, elegant and of most importance to him. Light, shadow, perspective and accurate features were not important. I found this exercise interesting, as Matisse's drawing technique is quite out of my own comfort zone, personally, I'm more practised and comfortable with using lots of tone to convey form.
I'm finding it useful to review these linear techniques and styles to remind myself of the broad variety of drawing techniques and styles and not get too locked into my comfort zone in terms of art creation.
Sacha Grossel is a practising Visual Artist from Australia.