The C4D in bottom right corner could be blended a bit better. Some of the water texture effects could be blended better also. The lighting is absent from this tag. Composition is kinda awkward. I like that teal effect on the top.
i'm with saviourking here...that HUGE c4d sticks out way to much try blending it abit more so it wont come as another focal itself cause right now thats whats it doing.