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Make a drawing assignment:
Cross-contoured, Proportional and Foreshortening Drawing

Apply these drawing techniques:
Use a variety of marks (within value shapes) with attention to pressure and proximity.
Use value shapes to depict differences in value across your subject rather than outlines.
Use gestural drawing techniques/marks to 'map out' the objects of your drawing and not outlines.

Apply new knowledge:
Use accurate proportions.
Use cross-contour lines to emphasize the shape of your objects.
Use foreshortening from your perspective.   
Use a definitive light source shining from the front, back, or side of your objects.
Use graphite tools, charcoal tools, kneaded erasers, etc.
Use an 18" X 24" sheet of drawing paper, which has been prepared with a light grey background before any drawing commences if you so prefer.
Use at least three objects of your choice. Here's the link to photo of the three objects:

How long has it taken you to be comfortable with drawing and coloring different appearances?