I agree with the perspective that the poster should be about the band. I am not sure that the bunny accurate reflects Cannibal Corpse's music or image.
I think that you are well spoken on this issue. Especially, since you are intimately aware of the metal scene and tend to focus these types of comments on the metal scene and its imagery.
This is like my Converge flyer. I did it as a joke and emailed to the promotions guy I know at the club. They all loved it and gave $250 for running 200 copies of it, which I got for FREE. That flyer took me 30 min. start to finish.