Well when making abstract bg sigs you want to blend the bg into the render, not the render into the bg. So you need to either put the render under the color balance layer, or change the color balance all together to match the render. In the second one if you just put some white brushing(it'll come out orange) around the edges of the render it'll blend it better. Also in the second one, the killzone render looks like you de-contrasted it. Click on the render layer, go to edit-adjustments-brightness/contrast and up the contrast a hella lot.