Charcoal Attempt

My first attempt at a serious charcoal drawing. I’d tried my hand at the medium on and off before, then put it aside for a while, but always experimented with basic forms. I’m happy with this attempt; it was especially relaxing 😃. Perhaps someone knows of a good, beginner-friendly book for self-study. I’m not a professional artist, which means I’m looking for something accessible yet sophisticated 😅.