Art class yesterday. We had to make quick portraits with bamboo pens or twigs (from our garden) dipped in Chinese ink. It took some time before I got the hang of it, but I must admit it results in very lively linework. On the other hand, the amount of ink is very difficult to control; a sudden blob of ink on the wrong location can spoil the drawing in an instant. But I loved it; I'll have to try it with Urban sketching as well.
I made like 20 portraits in about 2 hours, these are the four best.