Recently I've worked on the compositing of the motel background. Blender's node editor is a really powerful thing that can greatly improve the mood of the renders. It works the same as layers in Photoshop or After Effects. My goal here is to remove the polish look of 3D CGI by adding noise or dramatic lightning. In the same time, it could hide poor modelisation or textures (which is definitely the case here).

The first picture is a render with compositing, the second without, and the third one a glimpse at the nodes I've used here.