Between flames and smoke obscuring and overlapping the skull and it being in black and white, some areas were hard to tell if it was supposed to be skull, flames, or smoke. Maybe if I had zoomed out a little so the entire flaming head was shown and you could see the outline of the flames and smoke it would have been a little clearer? IDK.
I decided since I had taped off a border anyways that maybe this was the piece to test how watercolors fared on these covers. As it turns out, watercolors are the shits for these books. The covers have some kind of slick coating or treatment that makes the paint bead up and it was a heck of a battle to get a few washes to actually lay where I wanted them. So for future reference, if I want to work in color its going to have to be acrylics, markers, or colored pencils.