I usually shape heads by drawing the right and left sides of an oc-thing-like-a-circle and then at the top, put the hair, and the bottom ha a kind of upside-down triangle, like: \_/
--HAIR--
| 00 | <Like so (Do you like my eyes there?)
| |
\ /
\__/
For eyes, I draw a feint triangle and and an oc-thing-like-a-circle on it's side with points at the right and left ends, on top of that, then make the triangle inside of the oc-thing-like-a-circle a darker shada, then colour it.
________
/ / \ \ <Like so
/ / \ \
\ / \ /
\_/____\_ /