Pen and ink drawing

I've recently obtained some rapidograph pens, which I love. Here's what they are like: rotring international. My first attempt at a drawing with them was this lump of wood. Quite pleased with it, though I think they are going to take a bit of getting used to. You have to hold them pretty much vertical to the paper, and they don't seem to flow very smoothly if you do anything other than pull the pen toward you. But the lines are lovely and clear. I'm going to experiment a bit with stippling, too, though I'm not sure I've got the patience for that.