It's good to experiment if you ever feel like you're getting into a rut. These demonstration drawings were a good chance for me to try something different. Starting with a charcoal "wash" on the page to create a midtone, I layed out the foundation drawing with vine charcoal. I then used the kneaded eraser to pull out light shapes. It's good to also think of the kneaded eraser as a drawing tool, not just something for correcting mistakes. Finishing touches and any extreme darks are done with charcoal pencil.