It's been a while but I think I still remember the feeling well enough.
Celtic Frost did some interesting things, more Hieronymus Bosch than metal.
There is a modern death metal band from your region (aren't they all these days?) that often features the main character sulking around in the woods. I can't remember the name off the top of my head but it's pretty common knowledge and I'm sure the source of your friends' inspiration.
If it were me I'd go for cross-processing to get some funky colors and shoot into the sun with uncoated lenses to get some intense lens flare in the shot. Shoot from low angles. It's been my experience that death metal bands want to look like badasses but often end up looking just plain silly, so hide as much as possible to leave it up to the viewer's imagination.
Which band is it?