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Pen and ink on bristol board colored in Photoshop. I tried out my Kuretake brush pen along with a couple Micron pens and a normal brush on this one. As far as the Kuretake goes, I used it to outline Robins body and for some areas of rendering like the dimples and folds in his shirt and pants, his hair, face and mask and some areas of his boots. I used the Microns on his cape to keep a consistent line weight, with exception to some areas around his arms. I used a #4 brush and ink to block in the dark areas on the back of his legs, the bottom of his boots, the tail of his shirt and his wrist guards. I did not really like how those areas came out, but that's what these studies are for.