There are simple proportions that nearly everybody's face follows.
The eyes are close to the center of the head, and approximately split the head width-wise into thirds.
The bottom of the nose and the mouth split the lower half of the head into thirds.
Look in the mirror. Look at anybody around you. You'll see these proportions mirrored (though they are based upon skeletal structure, so excessive amounts of fat will obviously screw this up).
The eyes are close to the center of the head, and approximately split the head width-wise into thirds.
The bottom of the nose and the mouth split the lower half of the head into thirds.
Look in the mirror. Look at anybody around you. You'll see these proportions mirrored (though they are based upon skeletal structure, so excessive amounts of fat will obviously screw this up).