The bottom edge doesn't seem to fit with the rest of it.
Lighting is.. finesse, finesse, and a bit more finesse...............
The main problem I see is the lighting on each side of the start menu looks quite blown out and unnatural.
Less is more mate...imo.. of course.
Edit.. those lil taskbutton adornments looks eerily, recently.. reminiscent Just sayin'
Originality is a significant cornerstone of any designer. I would suggest trying to think more, design more..outside the scope of past designs and more from what comes to you naturally and originally.
I realize there are only so many pixels in a WB but.. you can do a LOT... that hasnt been done before.. at least.. recently.. with those pixels.
Look at Neone's, Kitty's work as examples.