This is a drawing made with a common office supply pen - the crystal bic pen. I find this pens to be exquisite to work with because you can get so much shading and tone - all with one tip of a crystal bic pen. 

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This particular portrait is sourced from a photograph featured in Juxtapoz magazine of a man from Nashville, Tennessee. When I saw his face, and his tattoo of "Fear God" sold me on drawing him.