First of all draw a circle.
Now draw these lines it'll help you to locate the area to draw eyes, nose, ear and mouth.
Now start drawing Levi's face beneath the circle.
Now draw his ear and eyes. He has small and Sharp eyes.
Draw his nose and mouth. Draw a curved line at the end of the circle to draw his mouth.
Now draw his hair about the circle as you can se in the picture above.
Now draw Levi's neck and collars of his clothes.