Lighting on the render is off so it's not working too well in that aspect, try a bit or blurring in the foreground/distance to establish a bit more depth. Background itself looks good, don't think the render works in there at the moment.
background is seks, try blurring the beginning and the end of the c4d to create (even) more depth. and maybe tweak the colors a bit, but it already looks awesome man. great job!