Looks pretty damn awesome to me, however you might wand to blend the edges of the curcular lookin' thing in with the diamond floorplate background as the contrast between the two is slightly jarring.
Also, I'm not too sure about the glass chatter effect as this implies there is a source of glass to be shattered which it doesn't seem there is. Trivial? Perhaps, but if I noticed it, others might.
Finally, I don't think the watermark on the bottom corner is ultimately necessary given that I doubt anyone would steal your graphic and even if they were, they'd just go over your watermark with a black paint brush.
I know it's a good trait to sign your work and I sympathize, but in this case, it's just distracting to look at and don't take this the wrong way but there's not a lot here that warrants a watermark.