That isn’t the ground. They are clovers. The ground is completely black.
Okay. I’m just not seeing it. Maybe once you do a render with more samples that detail will come out. Ignore that point, then.
I personally think that the rusty details look too large in scale (unless I have misinterpreted the scale in the entire image) and the texture of the ship(?) seems like it’s too low in resolution. Are you using fresnel on the reflections of the materials?