Another tut I followed, but did three little changes with each. CnC? v.1 v.2 v.3 ****, just noticed I forgot the border >.<
Your renders blend in too well with your bg, most of the time xD. Make the focal abit easier to see, and maybe add a few c4d's for flow.
Ah, there you go. I suggest darkening a side a little more, and add some lighting. Also, gaussian blur the bg at about 1, erase what's over the render, and sharpen the render. Then, I would say blend the render in a little, by adding a clipping mask. If you would like to know what that is, pm me I guess o.O.