>>5
I imagine you'd have to first learn to draw a manga face, then to do 3D modeling and then combine the two. Or I suppose having someone do the concept sketches for you would work too. It's tough going trying to model something without a sketch first.
But yeah, I've seen tutorials on how to make a face in wings3d or some other subdivision (winged-edge) modeling program. Can't remember where though. Might want to google for mirai/wings3d user forums.