Head proportions and all you need to know to draw a proportional face

    While learning to draw a human body first part you start is a head. Right proportions for the head and the face sometimes are very difficult to comprehend quickly, as everything good in this world it requires study and practice.
    First thing you want to start with its a simple front, profile and 3/4 views. If you just began drawing, you might want to sketch a bunch of heads in different views in a simplest way to get your hands and eyes get used to drawing the right shapes. It is quite a fact that the more you draw simple objects the more your hands learn. When I started to draw I  used to draw eyes all the time, they wasn't so great but somehow from a simple eye I jumped to drawing more complicated things.

Here are few examples with proportional marks:

Technically, when you want to draw a proportional head you draw a circle and then adjust a jaw to it. 

A vertical line across the ball where jaw line connects to it is where you should place the eyes, the line where the ball ends indicates where the nose should be. In order to place the lips, personally I draw a little circle on the chin to visually create a dimension of a chin and see where the lips should be located. 

I've seen a lot of people who start drawing human head from the eyes, then nose and lips, and shape the head afterwards, but, to be honest, its twice harder to get the proportions right, and have a pretty looking face in the end. 

Here are some more technical sketched that might help you too see the proportions systems or develop your own vision how to get things right: