Step 11: Darken in SpongeBob SquarePants' eyes, making sure not to darken the parts that overlap his mouth or his right eye. Draw a circle in each eye and smaller circle inside each of those circles to make SpongeBob's irises and pupils. Draw three thick, short lines on top of his eyes to represent the eyelashes of this Nickelodeon cartoon character.
Step 12: Tighten the right arm by rounding the trapezoid to draw the sleeve. Thicken SpongeBob SquarePants' arm, hand and pinky finger.
Step 13: When you darken SpongeBob SquarePants' body, use the main rectangle brick shape as a guide. Follow the guide, but draw the lines wavy instead of straight. Also, draw differently sized circles throughout his body. Don't draw too many, or he'll look weird. About 10 circles will do.
Step 14: Darken in the lower half of SpongeBob SquarePants' body. Make him slightly thinner than the original rectangle brick shape by bringing in the left side of him closer to the middle. Also draw a series of horizontal rectangles on his pants to draw his belt.
Step 15: Tighten his left arm like you did when drawing his right arm. Round the shirtsleeve and thicken his arm, hand and fingers. Draw a small curved line in the middle of SpongeBob SquarePants' palm.