Let me help. First, understand that you really should not DRAW noses; instead, you should SHADE the form of the nose. But you need a good form first, so focus on using correct proportion lines, and then begin by drawing in the BASIC SHAPES of the nose, followed by the details of the bottom of the nose. Remember to use VALUE when shading- no scribbles or it will not blend well.
Next, watch a few of the drawing tutorials in the videos by following this link below:
http://www.illustration-tutorials.com/how-to-draw-a-nose-part-2/