After quickly drawing in the face, I felt the geisha was a bit too old looking( most geisha are under 30) and since most geisha are very young, I decided to give her a younger more girl like look. I added the fan for shape and basically did a grey scale of her face, hair and flower ornaments.
If you like to draw out your subject matter, you can use charcoal or graphite. Of course many artists just use oil paints which are thinned down. Some folks use turp, thinner or naphtha to thin down the oil paint. Usually for less detailed objects the thinned down paint is easy, especially to paint shapes or to block in areas. Since the face is a bit more detailed I have used charcoal for the face of the Geisha.