I love the drama and the interest that you can create with charcoal. And I love the happy accidents, like that spray of charcoal beyond the top-left edge of the sphere. I don’t know what that’s called (maybe someone knows a technical term?), but I like that effect in painting too. You can see it clearly and strongly in this painting by Carol Smith Myer. It’s reminds me of sea spray flying off rocks.
Another thing I like about charcoal is blending it with my fingers. So messy, but so good.