Step 6: On the right side of the body, draw two lines that slope upward as guides for the other arm. At the end of the lines, draw a small circle as a guide for Jack-Jack's other hand.
Step 7: Under the body, on the left side, draw two vertical lines as guides for Jack-Jack's leg. At the bottom of those lines, make the sides wider as a guide for the foot.
Step 8: Draw two more lines under the body, on the left side as guides for Jack-Jack's other leg. The bottom part of the line on the right should angle outward to create the guide for the foot.
That's it for the guides! For the next steps, use darker lines for a more defined drawing.
Step 9: Draw a small arc sitting on the horizontal construction line, to the left of the vertical line for the first eye. Sketch lightly at first to get the shape right. Add a small line at the bottom to close off the shape. Add another arc to the right of the vertical construction line for the second eye. Pay attention to the size of Jack-Jack's eyes in relation to the head. They should also be pretty close together. When you get the position and size of the eyes right, darken the lines.