Excellent!
This has a completely different style than Michiru Yamane's original score, yet somehow remains true to the atmosphere and style. The epic rendition of "Prayer" grabbed my attention straight away, and the piano solo rendition of "Dracula's Castle" was great (I also like how neatly it segued into "The Cave." The violins playing "Prologue" was very interesting as well, I never imagined that anything could replace those flanged guitars. I also loved your rendition of "The Tragic Prince, it sounded very Danny Elfman-esque, as if it was from a Tim Burton movie.
I can think of no way this could be improved, except maybe adding a bit more of the cathedral organ (unless you don't want to take the stereotypical approach to music about vampires, that is).