I'm not sure if I can ask this kind of question here and if not then I will delete it, but I've been having trouble with rendering my scene. I use Cycles, 512 samples, plenty of light bounces, 5 film exposure, and default color management. Still, this render looks distinctly computer-generated. All the materials are, at least in my opinion, photorealistic, so it must be the lighting or maybe composition? I'm not exactly sure which is why I want some help. Any ideas?
Your brain is sensing the 'sameness' of all of the color variation you've introduced through the use of the Noise Texture node.
You simply need more layers and variation in size and frequency to break up the slightly regular pattern that perlin noise produces.
Here's a pretty simple example with some randomness built in for each individual object the shader is put on. Some color ramps would go a long way to make the effect more noticeable.
Your main problem is with the composition of the scene.
check this video:Blender Guru Understanding Composition