Portrait in Blue (step-by-step) by Varian ()
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An experiment in digital pencil. I used two thin-tipped colors - black and white - and did the pencilling on a single layer until I suddenly realized I was no longer sketching, but painting, lol. Then I used additional layers to reduce down the contrast that had been building and return to the goal of simply highlight and shadow.
A larger version of the final can be viewed here.