"Those are all Quake 2 textures with a bit of messing about to fit the theme - since doing this I've figured out how Quake 2 RTX materials work and modded it to load higher resolution models in maps so could improve on this a lot. There are a few free photorealistic texture packs out there that include stuff like that but would need some adjustment (roughness/specular, normal and metal/chrome maps) to make them materials in Quake 2 RTX." -Rroff
"A collection of Quake II RTX screenshots from the first half of 2021 — singleplayer, deathmatch, Action Quake, DDay mod, etc., courtesy of the Quake II RTX Steam Community."
"Quake II RTX is our ray-traced remaster of the beloved 1997 first-person shooter. In November, we introduced a ton of new features and enhancements, and now we’re back with Quake II RTX v1.3. This adds an awesome new photo mode for custom screenshots, along with a free camera and Depth of Field option for making cinematic-quality shots..."