First one has potential, as does the second.
The first tag has a decent concept, but execution needs work. First, I'd suggest changing the color of the c4d to complement the focal's color better. Second, your blending is way off. In perspective, everything happens gradually. The sharpest part should be your focal, with pieces further forward, backward, left and right blurring at a gradually larger amount. Take a look here for help:
You must login or register to view this content. Finally, give the background some texture, or at least something better than a wireframe c4d.
The second tag, to put it simply, needs to be tweaked. Nothing major, just make the focal a bit more distinct from the background. (Dodge/Burn tool is your best friend here)