`Show Your Work` by Austin Kleon has become a firm favourite that I'll definitely be returning to regularly. It is a short and easy read, full of simple but great advice which applies to artists in any field. It's the kind of book that you can dive into on any page for little nuggets of wisdom and actionable steps. Thoroughly enjoyable and thought provoking.
"The key is process, not product. Share something new every day (but don't turn into human spam). Keep an amateur's mind ― where the possibilities are limitless. Be a connector, a teacher, an open node. Don't hoard."
Pick up the book here.