yes exactly. this doesnt work with a pen or mechanical pencils though.
drawing-basics-how-to-sharpen-charcoal
you want to have enough lead exposed to get a variety of available widths for your marks.
another helpful tool is a plumb line... just a thread with something heavy enough on the other end to have it hanging straight down.
"When drawing from the model," he said, "never be without the plumb line in the left hand" — Every one has a bias, either to the right hand or the left of the vertical. The use of the plumb line rectifies this error and developes a keen appreciation of the vertical.
Henry Haley quoting Sargent.
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