Step 16: Using a pen or marker, carefully go over the lines to make your drawing permanent. After inking, get rid of every pencil mark with an eraser.
Final Step (optional): If you'd like, you can add a bit color to your drawing using color pencils, markers or even crayons. Use light brown to the inked edges to give the drawing more dimension and volume. Skulls are mainly white, so you can leave yours blank for an easier drawing. Don't forget to pause the video to draw at your own pace.