Sketch of a dramatic photo.
I used ordinary graphite, but also touched it up with "carbon" pencils:http://www.amazon.com/dp/B005UKDLB0/
I had never heard of carbon pencils, but supposedly they're sort of in-between graphite and charcoal. You get really sharp lines like graphite, but they're super-dark like charcoal -- hence the eyebrows being so dark. Weirdly, I discovered that graphite and charcoal don't seem to be compatible -- you can't draw charcoal on top of graphite -- it won't stick! Different allotropes of carbon?