Draw a misshapen circle for the shell; then add the neck, head, and tentacles.

Refine the basic shapes, defining the tentacles and adding the spiral pattern to the shell. Indicate a “slime” trail.

Continue refining shapes and begin shading, adding radial lines and spots to the shell.

Build up the darks, deepening the shading and creating the ridged texture of the shell. And he’s off! (Sort of.)