Step 1: Study the two main shapes before you draw. The bottom shape looks like a perfectly symmetrical cup but the bottom is pointed rather than flat. The top shape flooks like melting ice cream on top of a ice cream cone. The distances from the chin to the middle of the hairline and from the hairline to the top of Biebers head are about the same.
Step 2: Draw in the shape for Justin Bieber's neck.
Step 3: Add the beads. Notice that they make a V Shape.
Step 4: Add his shirt line. Notice the placement of the lines in comparison to the edges of the paper.
Step 5: Add Bieber's eyes directly below the hairline. His eyes are football shaped and the iris of the eye forms a U shape inside the football shape. Notice that there is only one eyebrow visible. Here is a close up
Step 6: Add Bieber's Nose. Notice the extra shape on the side.
Step 7: Add the shape for his top lip. The shape is like a flattened letter M and the corners of the mouth shape align with the pupils in the eye shape.
Step 8: Add the bottom lip. It is shaped like a banana.
Step 9: Add the teeth. Take some extra time to observe this step. Notice that I did not put in lines to separate the teeth yet, only points at the bottom and top.
Step 10: Add the highlight shapes in the hair. This step is optional and do not stress if you do not perfectly draw this difficult shape.