its a fantastic bg. simply breathtaking. tho i think you may have been let down with the choice of characters. a) they dont really look defined enough. sure they're clean and good quality but the lines are almost too blended in and it looks a little blurry. b) the choice of anime. you probably either liked the anime so you used it or you saw that the image would fit the bg well. there is definately nothing wrong with that but because the series is so old the drawings arent as good as you could probably find out there.
but thats just me. still, good wall.