Wow, great work!!! It's absolutely beautiful. And that dress, how it flows away.
When I saw the preview and read "album cover" I had to think imidiately of the song "I know I'm a wolf" from Young Heretics. But - yes, I don't want to make up anything here, since this is for another band. Doesn't matter anything here..
But I wanna say, I always find it awesome when I see art on deviantart that's actually for or was used by a band/author for a song/album/book series/film.