Well this first thing I noticed, was that you can't really tell you used c4d's. Because they look all blurry, when choosing your c4d's look at what kind of render you are using. This one here, I would class as a sci fi type of render, so I would be looking to use c4d's that somewhat resemble a sci fi look.
Next, once you have found some c4d's pick the one that flows the best with your render. That will kickstart you in the right direction when it comes to the overall flow of the tag.
Another thing to think about is pick more than one c4d, as using the same one doesn't always look good it will often come across as boring. But again, select the right c4d's for the job.
Try to match the colours of your render as well, in this one I think you have used too many colours which throws off the balance of the tag. I would have looked for some black and white, or grey and white c4d's and the only other color I would look at using would be a blue color or a red color but not both.
Next comes the placement, now this part can be tricky. Believe it or not, but I was going to use this same render for the sci fi theme coming up. But I couldn't really get anything to work with it lo,l so I switched renders so tbh right off the bat you made it hard for yourself. But anyway back to placement this involves some tinkering, as in moving the c4d around, resizing it to suit, and rotating it. Once you have played around and found the right spot for the first c4d place a 0.6px gaussian blur on it. This will be your backdrop for depth and flow, so place it wisely. Then choose a couple more c4d's make these smaller than the first one and find nice spots for them. Do not blur these ones though, then add some in front of the render as well do not blur these either, and the last lot use the first c4d you placed a blur on and have these as your fore front c4d's this will give you some great depth the rest comes down to lighting.
Hope this helps mate, but check your pm's I will send you a very good tut. That will explain what I have in better detail