White decimated model + same black model but shifted a bit. In sketchfab, white model have opacity dithered type enabled(value 0.135). Opacity shader add stroke like artefacts.
Postprocess effects: max grain and sharpness with soft vignette.
Based on scan by Geoffrey Marchal https://sketchfab.com/3d-models/aphrodite-called-hera-borghese-73f0a4fd99c6470d8214db1f59cc1f60