Before you start sketching the major part of the face,what you have to focus the is the eye. A women's eyes is the most important part of the face. The eyes emerge the character of a person. I used 4B and 8B pencil. 4B is for the all the detail parts and the sketch of an eye whereas, 8B pencil is for the darker shading of the eyes. You should practice a lot of sketches of different kind of eyes before starting to draw an actual face.