Step 11: Draw teeth inside of Johnny Test's mouth by drawing another curved horizontal line. Then draw a few vertical lines to indicate the separations of his teeth.
Step 12: Using the original rectangle shape and curved line as guides, draw in the rest of Johnny Test's head. When drawing the face, make sure it dips in a little toward the left eye and forms his cheek.
Step 13: The hair is a bit tricky, so this section about how to draw Johnny Test's hair is broken down in two parts. Darken in the line on top of the original rectangle guide. Before you reach the end of the original line, draw the line down closer to the right eye, move toward the ear and finally go up on a slant. Draw four lines on the side for detail.
Step 14: The top of Johnny Test's hair is spiky. Draw five spikes that resemble curved triangles minus the bottom. Draw triangles of different sizes. Use the image above for further reference when drawing Johnny Test's hair.
Step 15: Use the ear guide to tighten the shape of Johnny Test's ear. Male the bottom of the ear flat for style and draw a curved line (which looks like a backward question mark) within the ear to represent the inside of the ear.