"The Perfect Bait" by Bobby Chiu (Schoolism) is a great book to put on while you're doing some work. That's what I did this afternoon while working away on my own paintings.
You can download it from this link: https://drive.google.com/folderview?id=0BwkAzEOEQChdZ2ZiRGMwdnR5OEU&usp=sharing
Bobby has many tips for artists in this book. They range from improving ones craft, to staying motivated, to how to promote your artwork to an online audience.