Stone Ground PBR Material

This is my new PBR material work.
I wanted to make stone ground material for my next UE4 environment work.
I made base rock normal map and ID map from Zbrush sculpt, then imported these maps to SD6.
I conbined my PBR materials with material blend node. I already have ground and rock material, so I reused it.

Keita tamura 02
Keita tamura stonegravel
Keita tamura 03
Keita tamura 1493878684

SD6 Graph

Keita tamura 02

Zbrush Base Rocks