Bodom artwork have always had this more harsh style (AYDY,BD) and then the melancholy (SW,HB,FTR) and HCD was in somewhere in between them. HCD artwork is actually one kind of bastard, hasnt actually got any exact style. Hope this aint the new way for them. I don't like it. Mostly because it is totally new way.
If you think about the feeling, that artwork has more that kind of melancholy what the first 3 albums had, so maybe its a sign that they are reverting a bit towards earlier style in musical sense too. Though I have to admit that I personally liked AYDY more than BD. The guitarwork has gone towards american too much in my opinion.