Hoops, just a little technique for you here, you know im in a fragile state so ill keep it short,
When you dont have much solid background, like the Gilly sig, stick in a crowd photo, and blend them it, it gives it a bit extra, also a picture of the stadium sometimes works.
Also, i feel if you duplicate a render and resize it to about 250-300% you'll be able to blend it into the background also.