This is Olga from the Metro Exodus game. Rendered in game engine. No back scattering simulation, No RTX.
For this model no scans were used. Hair, body, clothing, rigging and animation done by 4aGames team. I did the following: base and expression models sculpting, retopology, texture painting, setup in the game editor.
Olga's head designed together with talented Concept Artist Vlad Tkach, check out his concept art here https://www.artstation.com/artwork/RYaoWX