Step 6: Right below Zim's body, draw two lines similar to long, forward-leaning letter L’s as guides for Zim's legs and feet.
Step 7: That’s it for the initial sketch! You have the basic shape of the alien Zim from Nickelodeon's Invader Zim. Now go in and tighten your drawing. From this point on, press harder with your pencil in order to get darker lines and a more defined sketch.
Step 8: Darken the lower part of Zim's eyes. Draw a horizontal line on the top part of each eye to give him a furrowed brow.
Step 9: Zim doesn’t have pupils; his eye are just shiny. To indicate this shine or glare, draw a couple of circles inside each of Zim's eyeballs.
Step 10: Use the original rectangle shape as a guide to draw Zim's head. Darken the top part of the line and have the left side angle out then drop down toward the top part of the body triangle. Draw a pouty mouth on the right side by having Zim's lower lip extend outward.