Step 6: On either side of the body, draw a line as guides for Plankton's arms. The line on the left bends up toward the eye, and the line on the right curves down. Draw a small circle at the end of each line as a guide for Plankton's hands.

Step 7: Draw two long, curved lines on top of Plankton's head as a guide for the antennae. The length of these lines should be almost the same as the entire body. Draw two small lines at the bottom as guides for Plankton's feet.

Step 8: That’s it for the initial sketch! You have the basic shape of Sheldon J. Plankton from Nickelodeon's SpongeBob SquarePants. 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 9: Draw the bottom part of Plankton's eye by using the initial circle as a guide. Draw a line near the bottom to represent the lower eyelid. Draw a circle for the pupil sitting on top of the lower eyelid.

Step 10: On top of Plankton's eye, draw a thick curved shape for the eyebrow. Bend the shape to give Plankton an angry look. Darken the sides of the initial circle to complete the eye.