the blue doesn't go with the green. replace the render with something tht matches the background. effects seem random too. no relative flow.
Usally c4d's and brushes don't go good with each other unless you truly know how to use both. Try to stick with one at first then move on to combining them later.Also try to use colors that work with your render.
Background looks a little bland to me. Some smudging there would set the scene for your focal effects
