You did a good job on the background. Those C4D's are nicely placed aswell (it are C4D's around the render right ? ), I do think you could have done more with the render.
You have done nice job with the background and smudging But, a poor impression of blending in the render fully into the background. Smudge the render in the front of the tag and add more light and some stars next to the render to give the impression of water droplets if this is about water Enjoy Z