The Witcher 3 HD Reworked Project is a mod created by HalkHoganPL (great username, brother), which is aiming to give a massive visual overhaul to the already amazing looking The Witcher 3, and the results are very, very impressive to say the least.
Work has been progressing at a steady pace, and the new and improved textures, while slow work to replace due to the sheer number within the game, are looking very nice indeed. The screenshots below show the improvements that have bene made in the upcoming 5.1 release of the mod.
The mod features many new high quality meshes in addition to textures, created from scratch, along with much higher quality textures that while are perhaps not as startling at distance do make close up objects look much much nicer.
You can check out the mod and download the previous version, v5.0 from here.