On the line of action site I found an article about mastering your pencil, which provides advice on increasing the tonal range that you can achieve with a single pencil. The idea is basically to fill in an increasing number of boxes on a daily basis to get an increase in tone across the page.
As I’ve had feedback that improving my tonal range would be valuable I decided to try it:
The exercise does seem to be valuable, though I have a way to go as there is another page of increasing shades to try. As might be expected it is getting progressively more difficult. Its likely I should be trying a similar exercise with other mark making approaches – such as conte and charcoal.