Here's the video:
http://www.youtube.com/watch?v=CI6e3npN1kg

Around the 0:55 mark (the leg), the artist thins out the giant blob of black into thin lines. Anyone know how the artist does this?
Using a brush and eraser seems very difficult since the artist is able to thin out all the lines equally.

I tried it a few times and I just get thick lines lol:
http://i.imgur.com/201PB.jpg