Stylized Outdoors (Misfire Animatic)

Renders of an environment I modeled for an animatic called Misfire.
Most asset textures were hand painted in Clipstudio Paint.

During rendering I tried to make the background cylinder not cast shadows on itself, but the tic box in the object settings did nothing. I tried using camera angles where the cylinder's shape wasn't too obvious.

The bright green trees in the screenshots are all duplicates of the original referenced tree in the scene that (probably due to being duplicates) refused to show as grey lambert even when assigned with the material.