Step 16: Use the initial lines as a guide to draw the right hand waving. Thicken up the line to form Koopa Troopa's arm, draw a few curves for his hand and thicken up the smaller lines for his fingers.
Step 17: Finally, draw the right leg the same way you drew the left. Thicken the line, draw a ring for the top of Koopa Troopa's boot, a few curves for the boot itself and lines at the bottom for the sole.
Step 18: That's it! You now have a nice sketch of a Koopa Troopa from Nintendo's Mario Brothers video games. You can stop at this quick drawing for a rough, sketchy look, or continue to the step below to go for a more finished look.
Step 19: For a more finished, inked look, carefully draw over the final sketch lines with a pen or marker. Wait for any ink to dry, and then erase your pencil marks. You now have a finished inked drawing of a Koopa Troopa! You can stop here or go to the final step to complete your Koopa Troopa drawing in its entirety.
Final Step: For a completely finished Koopa Troopa drawing, you have to color it. You can use anything you want: markers, color pencils or even crayons! Color Koopa Troopa's skin portion yellow, his shell and boots green and the front of his shell and soles of his boots light brown. That's it! You now have a completed drawing of Koopa Troopa from Nintendo's Super Mario Brothers games.