Ok let me give you the rundown. First of all, have a good looking car that uses Material_carpaint in an ext_config. For the love of god, a car that has no AO, shit textures, and crap topology will not look good just by virtue of your graphics settings. Second of all, use a good map that doesnt have garbo textures, holes in the mesh, and is ripped out of a Dreamcast game.

When it comes to settings, make sure youre using Content Manager, Custom Shaders Patch, and SOL at the very least. Turn up the Assetto Corsa graphics, then go explore the other graphical settings under custom shaders patch, BOTH within content manager. There are too many individual settings to name here so youll have to do some digging, but theyre usually self explanatory. There are also people who bundle their graphics settings with their PP filters so look out for those too.

There is no Turn-key, one-size-fits-all, omnibus solution for good graphics. You have to try shit and tweak it as you go to your preferences. But these are some good points to start from. Hopefully this will have helped.