This work is based on The Veiled Virgin carved Carrara Marble by Italian sculptor  Giovanna Strazza (1818–1875).   I could find no information on how to carve this face, except a video in Italian of one in clay.   I can only just about order a coffee in Italian!!   I came to the conclusion that the face needed to be tilted forward to get the light on the face correct.   I made a detailed model in Plasticine and used a Tile Profile tool as a pointing machine.  This is one of 3 “Difficult to Carve” faces see Olmec  and Self Portrait.