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I am a college student, and in my drawing class, we are working with
this exact problem. My professor emphasizes that we should not get too
attached to our drawings, or a specific line. We have done several
exercises in which we draw a still life with charcoal, and then rub it
out to develop a nice neutral gray in which to work. The original
composition is still there, but we can work it up further, and correct
any lines that may be out of proportion, as well as develop the negative
space. It is a great way for students to learn that a line is not
forever. Perhaps if you do the activity with them, they will loosen up
and be able to look at their work differently. Hope it helps.
University of Toledo