Well, that was just my opinion and the beauty is in viewers eyes and I just didn't find your piece of art appealing to my eye. But if you ask me about improvements then you could do the following:
Try to make the colors flow with each other better (Use shades of same color instead of many different colors)
Use borders (1px black or white)
Make your focus points (Render) more visible which means bring it to the front and maybe smudge some parts of it to make it fit into the picture
Atleast take out the top C4D (Blackish one) or put it on overlay, maybe erase some parts of it or so