Okay, so i guess i'll take this seriously in that scenario.
First things first, only use Mechanical C4D, don't use Flow C4D, i always disliked them, along with bubbles C4D of course. Light source, and shadows, you lack that. The background should be something dark, a dark color, like dark red or a dark blue. Renders shouldn't be set apart from each other, make them close, layered in order. Exposure control needed, and other adjustments settings such as levels, curves, gradient maps, brightness and contrast. Also for the light source i forgot to say, use a soft 60% density white brush and brush where you want the light source to be.
I think i have 2 or 3 tutorials in DA, try to check the tutorials section, they teach the basic composition of using effects in Photoshop, and some other basic techniques.