Modder ‘cnfilmm’ has released the Characters Reworked Project for The Witcher 3 that overhauls over 60 male characters. Do note that this mod is not from the creator of The Witcher 3 HD Reworked Project. However, these two projects should be compatible with each other.
Going into more details, The Witcher 3 Characters Reworked Project adds 4K textures to the male characters. Furthermore, it adds more details, improves maps, and offers better complexions.
You can download the mod from here. From what I know, this mod definitely works with the original version of The Witcher 3. It may also work with the Next-Gen version, though I’m not certain. In theory, and since this is a Texture Pack, it should work with The Witcher 3 Next-Gen.
Speaking of The Witcher 3 Next-Gen, you may also want to take a look at the following mods for it. There is currently a cool first-person mod that you can download. Furthermore, this mod improves the quality of Ray Tracing, and fixes the RT shadow pop-in issues.
Lastly, you can find below some comparison screenshots.