Pen Drawing (Brain Bank 7/4)

I found this image on another blog written by an artist who specifically sketches with pens. The pens in the sketch are the pens that she regularly uses to sketch with. I am really amazed by people who can sketch well just using an average pen. What amazes me most is the fact that this artist either mustn't make mistakes or must disguise them in very creative ways. I also really love the look of this particular drawing. It seems to be from a student's notebook but in reality is a really interesting and well done sketch.