There are many photography composition rules which can be applied to CGI, as well.
Here are few of them:
When you look at a scene with your naked eye, your brain quickly picks out subjects of interest. But the camera doesn’t discriminate – it captures everything in front of it, which can lead to a cluttered, messy picture with no clear focal point. What you need to do is choose your subject, then select a focal length or camera viewpoint that makes it the centre of attention in the frame. You can’t always keep other objects out of the picture, so try to keep them in the background or make them part of the story. Silhouettes, textures and patterns are all devices that work quite well in simple compositions.