Female head: 3/4 view
Stage1- Detail
Start with the blue circle. It's a good idea to decide wich way she'll be looking at this point since you can't put the chin on till ya know.Bisect the sphere vertically in half along the directional axis. I use 1 vertical line to decide the eye/nose mouth plane and 1 to decide the ear plane (not airplane..EARplane...wa ha ha)
The mouth line is halfway between the chin and eyeline. Normal proportions say that line is for the nose..but this is anime and the face is smaller. The nose line is a little less than halfway between the mouth and eyeline..closer to the mouth.
Here you will have to figure on what is halfway between the ear plane and nose plane to decide eye placement. Draw a line from the mouthline to the newly appointed eye placement point on the horizontal eyeline. make a triangle to figure where the other eye should go.
This triangle also serves as a nice guide to keep the features all snug and secure in the head.