Step 6. Vertical Shading Using the fine point pen, make vertical shading lines - at approx. 3mm spacing - over the entire face, ears and neck, except for the following areas. Blue shaded highlight areas Eyes Lips Eyebrows, if light in color The vertical lines can be drawn with a set-square, or by hand. They look 100% better if done by hand. If you prefer the effect by hand but don't have the patience, the following method can be adopted. Buy a 15ç wooden rule and profile the edge with some sandpaper to give a ridged non-straight edge. Tape this to the edge of the set-square. In order not to get get all the ridges occuring at the same level raise the set-square up and down on adjacent shading lines to imitate a hand drawn effect. This takes a bit of practice, but you'll know when you get there.   This concludes Step 6. Vertical Shading