Abstract Value Drawing
Think of composition of where to place them before actually drawing.
Draw 2 circles using stencils.....
Draw 2 Wavy lines.....
Draw 3 straight lines in ANY direction..
Now start shading in each section with a different pencil grade using your Tortillion/Pencil Stump to shade out to white.
REQUIREMENT: All sections MUST be GRADIENT - meaning going from light to dark creating a gradient value scale.