After learning the basic construction of the Manga / Anime head, there are other important factors yet to remember. There are many different types of heads and faces to be constructed. Such as the difference between the male and female head. You should know what makes an Anime / Manga female head look so feminine compared to a males' head.
Here is a great Anime & Manga Side Profile View Face / Head Drawing Method that is very easy to draw with very impressive results. Adjust the construction guidelines to achieve different kinds of Anime faces. Observe and compare how the different spaces of guidelines affect the resulting manga face.