Drawing a sketch is so light that you can remove it if you make a mistake. Be sure to keep your pencil sharp throughout the image. This will give you better results. Drag the line of the eye image, follow the drawing to simplify your workout process. Draw an outline with a thinly penciled pencil that when there will be an error it will be easy to remove it.TIPS: Make sure the pencil is always pointed to produce a maximum image and do not be too hard pressed, because it will leave a mark on the paper if you press too hard during the drawing process.