Geralt light knight beard on wich geralt has sideburns and soul patch with the stubble removed.
uses clean shaved skin, if you dont want to visit barber to aquire this style install beard lock mod https://www.nexusmods.com/witcher3/mods/216/?
Happy courageus knightly adventures !
first pictures are darker oned beard and second is lighter. 

instal instructions download the main file or you can download  light light knight beard witch is lighter colored and lastly only sideburns, locate or if missing create mods folder on witcher 3 directory andput unzipped files there. 

snake eyes mod used in pictures https://www.nexusmods.com/witcher3/mods/1215/?  thanks to mattmaniakgry