I tried to draw a sphere, a box, a cone and a cylinder in the same space. Tools: charcoal, white chalk and toned paper.
The first one was drawn without any reference, but I looked at some reference before drawing the other two.
Things I thought about during the process: core shadow, cast shadow, highlight, reflected light, highlight on edges and gradation on a flat surface.
Is there anything I'm doing wrong, like the value changes or the placement and shapes of shadows? Let me know, thanks!