With this Reshade 3.0 Preset your game will look like GTA Vice City! Installation: Just download this preset and drop the ini file in your GTA V Directory Ingame: Press Shift + F2 to open the menu and click on the + and then click on Vice City colors, done!

Also I recommend installing LA Roads and NaturalVision 2.2 like i did in these screenshots.
Sfxthelazy link for comparison pictures: https://sfx.thelazy.net/games/preset/9220/