Some of the art had to be redone a few times. For example, in this acrylic piece, I re-read the chapter and it said that Quilah was carrying 150 pounds on his back while being made to mach in circles all night holding his rifle in his mouth. I forgot the backpack (see first pic) – and so went back and added it later (thankfully thats easy to do with acrylics) (see second pic).
