The nose is one of the most noticeable, and also the most difficult features to draw, because of the way it protrudes from the face. Generally speaking, the nose has four surfaces which the light will vary upon: each of the two sides of the nose bridge, the top of the nose bridge, and the surface that curves back towards the face.
The key in drawing the nose is to avoid lines. The nose is made up mostly from shades around the nose bridge , and some darker areas around the bottom part of the nose.
The uppermost protruding point tends to catch the light best, so a highlight runs through the top of the nose bridge, all the way down. Either side of the nose bridge is shaded depending on the angle of light. occasionally, the light will cast a shadow below the nose, and on the side. Make sure that the shades on the nose bridge is well blended, for it will appear disconnected from the face otherwise.