The model has real world scale and can be further subdivided without problems. For the preview images it was subdivided one time.
All used textures and maps are included: one texture / diffuse map, one glossy map (invert for roughness), one subsurface map, one subsurface colour map and one normal map. Every image measures 4096 x 4096 px. UVs are unwrapped and everything is named properly.
Do not hesitate to ask any questions.