I recently watched the documentary Sweetgrass, about one of the last private sheep ranching operations left in Montana. I was particularly taken by this particular sheep, who was wearing a bell. Smitten enough that I paused the movie and grabbed my sketchbook to make a quick sketch.
After scanning it in, I used Brittany Lynn’s suggestion for isolating the sketch marks in order to color it in Photoshop. It worked like a charm, Brittany Lynn, thank you!