Worked on a base mesh created by Anton Dupuis. Please check out his Sketch Fab page https://sketchfab.com/gravitybwlast., also check out his Artstation https://antoinedupuis.artstation.com/. Many, many thanks to him. He saved me a lot of time, from either sculpting her from scratch or from ripping her out of the base game myself. His speed sculpting is awesome.
Basically i imported it into Zbrush and started sculpting in additional detail like pores, wrinkles, beauty spots and bumps. Hair was completely recreated in Fibremesh from scratch. Then it was rendered in Zbrush too and onto photoshop!
You can download Anton's original model here: https://sketchfab.com/models/5a3c1688c0a3455ea3