Looks a bit inconsistent with the materials. What references are you using? Show your primary reference, put it side-by-side with your assets, this should help you identify the main issues.
You should be looking at photo reference of a specific real world location. Look closely at the photos and try to analyze the material layers required to replicate that look.
We have lots of great tutorials and resources for modular texturing on our wiki:
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We have lots of great tutorials and resources for modular texturing on our wiki:
http://wiki.polycount.com/wiki/ModularMountAndBlade
Plus check out the Vertex books!
https://ryanhawkins.gumroad.com/