Hey Roger,
Very nice work, I'm not much of a skull guy; but it is interesting how many skulls you worked into the design. The shading work looks great and adds a lot of depth and detail to the piece.
The backgrounding leads me to ask if it is going to be black; because the pebbling really helps define the design on a black seat. I was struck by how readable the Destination Destroyer seat was even though it was dyed black also. That was purely because of the backgrounding.
Good work,
Dave