Step 11: Use the initial line as a guide to draw Koopa Troopa's left arm. Thicken up the line to form Koopa Troopa's arm, then draw a series of curves around the circle to draw his clenched fist.

Step 12: Draw the left leg by following the initial shapes as guides. Thicken up the line first, draw a ring on top of the circle, then use curved lines to form Koopa Troopa's boot. Finally, draw lines under the boot for the soles.

Step 13: The left arm blocks some of Koopa Troopa's turtle shell, so only draw the visible portion. The base starts at Koopa Troopa's face and ends at his feet. Use the initial circle as a guide to draw the outer bit of his turtle shell.

Step 14: Draw a few lines within the turtle shell for the pattern. At the bottom of the shell, add Koopa Troopa's tail by drawing two curved lines that meet at a point.

Step 15: Darken in the initial circle shape to form the front part of Koopa Troopa's turtle shell. Then draw four curved horizontal lines in front to indicate the "bottom" part of the shell.