i haven't read the story finished, a friend of mine has it (part of the books of blood series
) but it seemed like horror to me (i think there was a gory cat killing that got to me) with parts of comedy and fantasy
but my understanding of dark fantasy is a fusion and balance of both genres so as long as u balance your graphic blood spilling scenes with those of fantasy nature it should stay dark fantasy
to me HP Lovecrafts work combines fantasy, horror and a bit of sci-fi but to me it would be dark fantasy
ok thats my 2 cents worth