Create an aiImage node for your Primary Displacement (Red Channel).

The for your character (cinematic film render or real-time game engine)?

Set your to around 0.3 to 0.5 for realistic facial skin.

Because the scan data comes as a flat image or a generic head projection layout, you must align it to your custom character's topology.

Pores hold different amounts of moisture. Derive a roughness map from your TexturingXYZ data; pores should be slightly shinier (darker on the roughness map) than the surrounding skin peaks.