I like it( sorry for answering so late, im a bit bussy lately :S ). i checked your other works, and like them, when i saw them i coundnt think of another thing than evanescence.
For the orb personally i would try adding more blue tones, it would make the orb less plain( i read once that the more tones you use of one color the better, like tuquoise, aquamarine, etc).
another thing you can consider, is adding a gray-blue value in the inside the obr in the perimeter, it would add some volume to it.
hope it helps.