I ALMOST said everything looks perfect except i realized one thing. The lighting on this sig is off. It is dark on the left side of the render whn the lighting is supposed to be coming from the left. However if you fix the lighting this is your best sig yet. It looks awesome. The text is PERFECT, the blending is PERFECT and the background looks really pretty good, the colors go well with the render as well.
I'm glad you are applying everythign you learned. You should do this every sig, though sometimes people forget it.
I would sya just fix the lighting and you have a great sig. Great job.