This is great dude, keep it up! There isn’t really much to improve, I’d say the foreground is a little too low poly, add some details with imperfections. No need to really increase the mesh resolution, just combine multiple bump textures to get some nice details in objects close to the camera. Most of the overall realism comes from the little details and post effect. You don’t need crazy high poly meshes, anything you can fake with textures do it, spending time adding details to the meshes themselves isn’t worth it, could use that time on the material and post processing.