I really like the effects you' ve got in there but the problem is they don' t blend with the render. I' d like to see the render more "swallowed" by some of the effects, especially those rocky-looking c4d' s.
The lighting also needs some work, it just seems so be coming from every direction, I' d make it more focused and lighting up the render from one direction. And check out those sparks in front of him, they just seem to fade into nowhere.
Another thing is the choppy edges of the render, watch out for that
Overall I like it though, it has some nice colors and interesting effects, keep it up bro