Wow, those colors are awesome together! I love how everything harmonizes together. But...she doesn't seem too creepy to me. It's probably her body; she looks too human to be creepy at all. :/ Maybe if you played with proportions and made her more emaciated and skeletal or just plain uncanny, then she would look more unsettling.
Have you checked out the art of Frank Kelly Freas? He was a popular SF/Fantasy artist for many years. (Google him, if you're curious.) Your work has a similar 'feel' to what he did. (This is intended as a compliment, I hope you see it as such too!)