The head is a bony structure that contains the brain and sensory organs. It includes the eyes, nose, ears, and mouth. It is the top part of the body in humans, apes, and most other animals. Having the sense organs close to the brain allows organisms to respond faster and have more efficient digestion and nutrient absorption. It is also a symbol of power and authority. It is often used in colloquial speech, especially when referring to a leader. It can refer to a place, such as head of the line or head of the stairs; it may also refer to something in particular, such as a head for figures or a head for heights.
To draw a Custom Head, all you need to do is change your skin or find the username of a Player that has the type of Head you want and place it in the world.