As a person who frequents metal shows (like twice a month at least,) THANK YOU FOR WRITING OUT THE NAMES OF THE BANDS! Maybe I'm just not kvlt enough but I still struggle reading some band logos. I wish more concert posters would do this. Anyway, this is pretty good! The illustration gives off the vibe that these are doom/depressive/drone oriented bands? This poster doesn't exactly scream "FUCK YEAH METAL SHOW HYPE LET'S MELT OUR FACES OFF" but I think that it could work in the context of the bands. There's a good balance to the poster, but I can't quite put my finger on it- I think that the white text and font towards the bottom slightly throws things off.
Regardless, this is a pretty cool poster and it would definitely catch my eye!