Not into the skull theme, but I like how the flames make the tank look like it's peeled open. Not sure if this was what was being portrayed, but looks like the take has rib bones. That is a cool concept!
Dont get me wrong, I highly respect the talent and vision of those involved in creating that art work (and yes, its more than a tank, its art). But I would never put anything like that on a bike I own, its just too flashy.