This is really, really well done! I love this art style a lot - the sketchy, dry paintbrush-y style The lighting is amazing, and you did incredibly well on the shadows - giving them colours makes it ever so enchating! Especially with the brown and purple together - hard combo to pull off, but you nailed it
Thank you for a nice comment! If you love this kind of style, definitely check out art of Nathan Fowkes (nathanfowkesart.deviantart.com) especially his gouache sketches. I love those! He is one of my favorite artist and also a great teacher. I learned (and am still learning) so much from that guy.