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For this exercise any pencil or color pencil or maker or pen will do! I used a 4b pencil.
It doesn't matter so much where the material comes from, as long as it's good.
To me this was a really fun exercise. I loved watching it unfold as I put each line down.
You will need a reference image, you could make it a self portrait if you want to use a mirror or photo of yourself. Lightly sketch it out and then begin to use lines going in all different directions to fill in the portrait.