thank much for your question
tissue is useful for smoothing the pencil line when we make an image, you can try it, after you make a few lines of facial pattern, and do it to rub the tisue on the line you have made, then, by itself, the line will look more smooth.
you can do it, by rubbing it slowly, don't get too pressed. ok
RE: drawing imagination of a woman's face and a short haircut