So, for the next level. Nose is essential. I used 4B and 8B pencil. since, i am a beginner myself i don't use a lot of pencils for the shading as i do charcoal most of the time. Using different shades of pencil helps you enhance the nose and makes it look more realistic. Make sure that you practice a lot of parts like lips,nose,eyes,ears before you start sketching the face.