Oh, I love Arvo Part! I've already heard lots of his music. Anyways, yeah, I can see what you're saying. It depends on what kind of spirit you want, a godlike being or some spawn of fire. I'd say you chose godlike.
I look at this, and it screams "Ultimate Evil", like something that was locked away on some planet, in a galaxy that's on the edge of the universe... Something that would represent a threat to all life.
In addition to the 1980s sci-fi feel, this illustration is also reminiscent of Lovecraft, though the head reminds me more of a prehistoric amphibian that too had a boomerang shaped skull. Can't remember this animal's name, but knowing you, this was intentional on your end.