Looking pretty awesome! Not every edge needs to be scratched exposed metal. You can highlight and pronounce edges in other ways. A slightly lighter diffuse edge with slightly brighter spec works great. When you have ever edge damaged not only does it stop making sense, but it starts to become noisy. A good way to do damage…
Vegetation needs some fake subsurface skattering ;) Shadows on leaves r too dark. U can fix that by adding a little bit of self-illumination to leaves' shader. U can plug the diffuse into the Emissive channel, but first u could Multiply it with a low-value constant in order to control the "subtleness" of self-illumination.