Black and white render with a colour background never looks great to be honest, and the stock looks really low quality. Background doesn't look too bad, just needs to be lighter, with some more colour and effects.
I'm guessing this one was rushed Fletch?
Like caspa said a black and white render does not suit the coloured background. To improve it I'd suggest making the whole thing B/W. You could then add some colour to the render maybe colour her lips or dress.
I don't like how the render is black and white and the rest of the sig is coloured. The background looks good, with all the vectors and stuff. Try to find a render that will go with the background, or add some colour to the current one.