I keep a tiny sketchbook on me at all times. It is perfect for when I am taking the bus or train but don't want to lug around my large hardcover sketchbook. Being able to scratch down ideas on the go is just so important because I can only hold onto so many pictures in my head.
After transferring and refining the sketch I come in with powdered charcoal for some base values - especially in the softer areas like fur or sky - then add details and texture using a carbon pencil.
At this stage I am deepening the darkest blacks and making sure the details are all there.
Usually I finish a piece with some soft digital color, but for Forte I always intended to keep it black and white. So I have just cleaned up a few edges and smudges to tighten the lines.