Please find the below description about how to draw a face with proper proportion:
Ideally body length should be 7and half times lengthier than size of the face till neck.Shape of the face is like an egg,see pic1.and divide it in to 3 portions each in the middle of rest of the space,to draw eye and ear in same level,nose and at last lips.See pic 2 and Pic 3
How to Draw a Human Head
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1. Start by drawing three oval shapes, one large one and 2 smaller ones on the left and right side of the large oval. Add also thin guidelines such as a vertical line and two horizontal lines to serve as a guide in drawing the eyes and mouth of the model.
2. Then using the first guideline draw now the eyes. In drawing the eyes draw a pointy oblong shape with four circles in it, add also some wavy eyelashes since for this picture the model used is a young woman.
3. Lines to illustrate her eyelid.Then in the middle of the face and along the vertical guideline draw now her nose.In drawing the nose, remember to make the lines broken to achieve an effect
4. Now draw the lips on the second horizontal guideline.Finally draw her hair and a squiggly line on her left ear and then you’re done drawing her.
5. Outline your drawing with a black pen or marker and then apply an amount of shading on your drawing using a charcoal pencil or a regular pencil. And then apply a minimal amount of colour by colouring her lips and eyes.