Step 16: That’s it! You now have a nice sketch of Sheldon J. Plankton from Nickelodeon's SpongeBob SquarePants. 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 17: For a more finished, inked look, carefully draw over the final sketch lines with a pen or marker. Wait for the ink to dry, and then get rid of every pencil mark with an eraser. You now have a finished inked drawing of Plankton! You can stop here or go to the final step to complete your Plankton drawing.
Final Step: For a completely finished Plankton drawing, you have to color it. You can use anything you want: markers, color pencils or even crayons! Color his skin green. The eyeball is yellow, and the pupil is red. The eyebrow is black, and the inside of the mouth is brown. That’s it! You now have a completed drawing of the villainous Sheldon J. Plankton from Nickelodeon's SpongeBob SquarePants.