Not bad, but you have a few things that need attention.
The main thing for me is the contrast levels of your tags.
When you over use contrast or saturation, it tends to make parts of your tag looking a bit too sharp or jagged.
This tag isn't too bad but it has issues with blending.
A really simple way to blend the edges of your focal is this:
Use your eraser tool, but change the brush to a 6-7 px soft brush.
Lower the strength to about 15% opacity, then erase around the edges of the render. This will take away all those jagged edges and blend your focal with the bg.
Last but not least, try not to just spam out your c4d's but place them in a more creative manner that would compliment the atmosphere.
Lighting needs some work, but it's not horrible.