I like the background, and the render fits well. There's just something off about the left side i can't put my finger on
Looks like there's a drop shadow on the clipping masks... the shadows are on the wrong side according to the light source and I don't really feel them. The light source is also on the wrong side of the render and it's a bit strong.
You can see the clipping masks all to well on the left and right sides. Im not a big fan of that becuase it looks like you took the stock and stacked one right ontop of the other and added color. Which by the way, I admire your selection in colors for this sig. They fit really well and flow niceley together. The text is suiotable, I guess. I dunno dude, just doesnt look completely finished to me.