I have read Jezebel upto Kiara's POV and wow! I think it has has the potential to be a best seller in the range of Harry Potter, Eragon etc. In fact, I think, if made into a movie, it will be a huge grosser - Ensure you have all your copyrights in place and dream of becoming a millionaire!
One suggestion - do not give teaser's/hints before or after a chapter. Let the suspense unravel with the story. Kiara's POV was great because it was so unexpected. But then you let out a hint about the 4th sibling. Takes away from the suspense :(
Anyway, I'm hooked, not just to this story, but to you as an author!