I thought I'd quickly show you a sketch I did of an old man I did on the bus.
I was sitting across the aisle from me, on my way home from the University this week. I couldn't resist that flat cap, although in the end I only had a few minutes before he got off!
I painted him when I got home - I'm really getting into the watercolours.
You can see lots more drawings of people, portraits I've sketched on trains, (always clandestinely!) as well as all sorts of other sketchbook work here.