The Witcher series is a huge visual inspiration for the game. Characters wear just barely fantastic versions of historical century clothing. The story and tone are also pretty much right on the money.
ArtStation - The Witcher Wild Hunt Skellige Armor, Marek Madej
Fiend is an official artwork for the world of The Witcher and the Witcher card game GWENT, video games created by CD PROJEKT RED. The artist that made this
Video Game Art - The Witcher Wild Hunt Steelbook "No Man's Land" Version (Front)
The Witcher 3 – Steelbooks / StudioKxx
The Witcher 3 Gwent Cards and Concept Art by Marek Madej Mais
A faux poster of a modern, noirish, Witcher. The Witcher - A Matter of Life and Death (Modern)