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The first of a handful of commissions that I did recently. Never drew the Teenage Mutant Ninja Turtles before so it was quite fun to jump into this one--hope that comes across!
Below is the initial prep sketch that I did which I then scanned and tightened up a little in Photoshop. I then blow it up and print it at the final size (in this case 11"x17") and lightbox it onto Bristol. I then ink the entire thing with Sumi ink and a brush (Raphael or Windsor-Newton round sables, size 2 or 3). The most time consuming part is doing the ink washes and building up those values. When that is over I then go back in and go over some of the foreground inks with markers or brush as the black of the ink loses a little of it's brilliance after doing the ink wash.