No, noise isn't needed anywhere. Use the Raise and Lower tool to achieve optimal awesomeness and realism. The scaling of the river rushes is way off and looks bad surrounding the river like that. The whole jungle thing is rather empty. To achieve moon lightened shiny effect, use the glow doodad instead of leaving the river with full color blast. I would add background mountains and maybe work on the camera. I luek the sentinel on rock thing.