While I can't say I like your background at all, it's a rather nice model.
I'm not too sure about the staff, though. Have you forgotten that three circles in that triangular arrangement is a symbol of Nurgle? Then again, at least you didn't illustrate the bhavacakra! Beyond that, though, I worry that the three circles might be a little small. 40k miniatures rely on a degree of exaggeration. I might make them a little bigger?