I saw a print of this illustration recently by Nick Tankard and was overawed by the detail in it. The image is made up of the tiniest fine ink lines. It must take countless hours to produce. I would never have that level of patience (even if I had the skill to create something like that!). I thought the resulting light and shade in the image was amazing.
Nick Tankard: Place Charles De Gaulle, Paris
There are more illustrations from the artist on his website here: