In art, body proportions are the study of relation of human body, or in general, animal body, parts to each other and the whole, essential for depiction of the overall figure.
Some common proportional relationships for humans:
Body:
The average adult human figure is about 7 to 7.5 heads tall.
The idealized human figure is traditionally represented as being 8 heads tall.
The head also can be divided into thirds - from the top of the head to the bottom of the forehead, from the bottom of the forehead to the bottom of the nose, and then from there to the bottom of the chin.
The width of the head is between four and five eyes wide.
The height of the face is about equal to the length of the hand.
The eyes are separated by a distance of one eye width.
The bottom of the nose to the corner of the eye is equal to the height of the ear.
The width of the base of the nose is equal to the width of the eye.
The width of the mouth is equal to the distance between pupils, or the width of two eyes.