I did this drawing in Photoshop using the Rubber Stamp Pattern tool, Hue/Saturation layers, and Texturizer for the canvas. What a great tool! By creating a Hard Light layer and painting on it over the canvas...and using the Rubber Stamp Pattern of the original image it makes for a really fun experience to see the textures and darks/lights appear. I put a Hue/Saturation layer on top with the Saturation down to zero to create the black and white over gray canvas.