Like the physicality of it. It's always a question of access with these kind of documentations of a musical subculture. To most of the audience here (Eric rose excepted), these seem exotic because we're old farts that don't go to heavy metal concerts. So you can expect a certain fascination there. But that is only a first step. Two questions could further your work:
What is my intended audience? The scene, the populace at large, newspaper readers, the art market?
And in the context of my intended viewership, what do I want to show them? Is it some insider feeling? Or do I want to present the participants as out-of-their-heads freaks?
Essentially, are you within or outside looking in?