Constructive drawing of a still life of geometric bodies:
Partial inclusion of tone. Volume transfer. 
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Partial inclusion of tone. Volume transfer.
Enter a light tone in the shade of your own and falling; decide the tonal relationship between the shadows: the shadows in the foreground should be darker. Enter the chiaroscuro. The border of light and shadow is darker than the shadow itself, therefore, when chiaroscuro is introduced, the shadow acquires signs of a reflex.
The cube has chiaroscuro hard; the cylinder has soft chiaroscuro. In addition to softness, chiaroscuro gains airiness in a ball; it, like an ellipse, is located in space. Check again the flatness, that is, the state of the aerial perspective of lines, shadows and chiaroscuro. And the drawing is finished!
The constructive drawing of a still life does not include the concept of tonal relationships. All objects in a still life are like one color, because the task of a constructive drawing is to build a volume in space using a line and light. Constructive drawing is the basis of the drawing in general, its base. Only relying on this base can we move on to the following tasks, such as tonal relationships, materiality, and so on.