Sketch head of the clothes should be how to deal with?

First of all, type, type played well after the beginning of the base, layer by layer slowly paint, first paint the dark parts, with 6B, 8B, 10B to paint. Can not be very fast. When the black is almost done, use 2B or HB to draw the light color, also layer by layer, do not try to be fast. That will make the lines look rough and the picture will look gray, giving you a very unfresh feeling. Also, don't make the type very dark at first, it looks boxed in. These are my suggestions. I am also learning. You cheer oh!