So I chug along with the skeletal details. It is very hard to get a good shot on this door without a glare. I continue to go back and forth with black and white to carve out the details. Once i get it just right I will add a translucent yellow and brown to give the bones their natural color. I am totally freehand spraying this piece. It feels good to get back to that. It feels like drawing with your pencil in the air. You just have to remember not to grip the brush to tight, and let your eyes look at the image your are drawing, not the door surface. It is kind of like drawing with a light saber, you have to trust the force, or in this case, the lines your eye is observing. It is contour line drawing with an airbrush.  I am using an anatomy book to model my bones.