Hi @VirtualSpaces.
I suggest you a few things
After you get better textures as @Wing suggests, play with the bump, roughness and brightness of them. (FREE Texture and Map Generation with Materialize - Easy Texture Creator - YouTube)
In the camera tab, decrease the FOV of the camera, I think you have it too wide and that takes away realism.
In the same tab load a color map that enhances the scene. (PNG LUTs, how to creat and use it in shapespark)
Finally, get good quality objects but not too many polygons, remember that this gives realism but can load a lot the scene. (Top 5 Websites for FREE 3D Models - YouTube)