Updated: Dec 7, 2020
I had to do it. Since Metro Exodus supports Nvidia's Photo Mode, I decided to take some awesome snaps, I will update this as I generate more. The base game supports Ray-Traced Global Illumination (Sun & moonlight), while the DLCs support additional Light source Ray Tracing. Reflections are all screen-space effects.
Update: This was originally for Sam's Story, as I had just finished my latest playthrough of that DLC. But, I have updated it to cover the base game and the Two Colonels DLC, too, which I have just started playing on Ranger Hardcore with no HUD.
Metro Exodus Screenshots
These are taken at 1920x1080, Extreme Quality, Ultra RT, no DLSS, Hairworks On, Advanced Physics On, Motion Blur Normal.