A free mod for Fallout 4, by Hein84.
Vivid Fallout - All in One is a complete overhaul of the game's textures and a lot of new content. The game's world is now much more varied and there are a lot more things to see and do.
The game's original textures have been sharpened and the textures of the things that are now in the game have been improved. There are also a lot more new things in the world, like trees, rocks, roads, bridges, and some concrete stuff. The textures of the items that can be seen in the game have been enhanced, in some cases, they have been completely changed.
All you have to do is download and install it.