The Head itself should be 4 big eyes wide:
Half an eye on the left, eye, eye, eye, half on
the right.

The Ears should be located on horizontal
lines drawn out from the eyebrows and the
nose.

OK..Here we are at the beginning. The
human head is pretty much an "egg" shape.
the set up for this is to draw a circle
representing the top of the head and an
inverted cone for the chin.

Anime chins are much sharper than
standard chins. Don't go making an
arrowhead out of the chin but think more
along the lines of the bottom half of a heart.
(the cartoon kind of heart..not the
biologically correct heart)

The placement of the nose should be located
on a horzontal line between the eyeline and
the chin line

On a normal human face, the width of the
mouth would be determined by the center
point of the pupils of the eye. Anime
mouths are somewhat smaller so I use the
inside corners of the eye as a guide.
Experiment with whatevers best for you.