Not bad if your a beginner, the smudging is ok, i'd attempt playing with the shape dynamics and scattering of the brush to get a better more detailed and appealing look. Looks too plain imo, Needs some brushing, or some C4D's something to bring this more too life, the render isn't blended too badly, but it's not the best it could have been done. I would suggest getting some C4D's and smuding them in the open space, then maybe add some brushing on overlay/Colour dodge ontop of the brushing, to add more detail and depth to your piece. The random halo type thing above the render is a nice addition, but doesn't compliment the piece at all in the current state of it. Is that bevel and emboss for the border as well? If so you need to get rid of it straight away and add just a simple border to compliment this piece for now. The text is nice, but is a distraction point because it's away from the main focal. So yeah, if you get some more detail, some better blending, and some lighting done in this sig, it could be pretty nice.