Good light source, nice c4ds and all but, the c4d is like 'at the beginning' of the sig, ( closest to the 'camera' ) so that should be either most sharpened or most blurred ( because its so close )
because atm the render is more sharpened than that c4d and thats just wrong
also since the bg is a smudge ( I assume ) you should make her head + hand + cape or w/e it is dissolve in a smudge so it blends in more with the 'theme' of this tag
and maybe at some gradient maps of all colors and put the on soft light with low opacity so it gets a bit diversion in colors

keep it up man i actually like this tag ( sorry for the rant though xD )