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An old excersize I did with a tutor was to really exaggerate light on a subject and only draw the shadow. The different grain of Shadows being challenging, and making form without drawing outlines a good excersize for demonstrating when you don't need a mark.
This usually won't turn into nice drawings but helps with seeing the subject better when you do want to add depth or richness.
I did think about putting loads of cigarettes in the mouth or gold tooth.
I’m struggling with making faces more 3D. Does anyone have any suggestions?