This article is an update of the March 2012 mod list, and most of the mods on this original list are still valid and usable. It is, however, a gun that runs on Creation Engine, and it has a development kit with an active community. It's more than three years old, was already a bit dated when it came out (Bethesda's four-year development cycle shows), and with gorgeous games like The Witcher 3 having been released this year, Skyrim doesn't really have much to offer on the visual front.
Skyrim isn't exactly a game that has visually aged well. Either way, you've installed the game, played a few minutes, and realized something: wow, this is pretty ugly.