Most 'realistic graphics' mods make games look worse, but that's not the case with NaturalVision Evolved. The long-in-development Grand Theft Auto 5 mod is a comprehensive revamp of lighting, textures, models and much more, but it remains faithful to the art direction of the base game.
You can now download a Single Player Beta of the mod - and even if you don't plan on doing that, it's worth watching the trailer below.