Please refrain from pointless comments which don't add to the OP's skill through constructive criticism, or even avoiding mentioning the strong points and flaws that could be worked on, in the piece at hand.
This is probably most accurate - the topaz used means the whole depth of the piece is ruined, since the contrast in each of the lines becomes higher, making it seem flat, and making your eyes jitter across the piece.
The focal point is too high up, meaning the eyes have to search. The effects could be far better, and in terms of colour, there's no obvious approach or organisation - as far as I can see there aren't any preconceived colour swatches or complimentary/secondary colours used, meaning overall it seems off, and unappealing. Lighting isn't awfully thought of, since the light sources are all around the place.
Avoid using topaz/anisotropic diffuse as a finishing touch (it ruins depth).