The Elder Scrolls 5 Skyrim's vanilla textures aren't exactly the greatest. Thankfully, retextures and ENBs are able to bring the game's visuals to modern standards. However today we do quite the opposite with the Artistic Skyrim Overhaul.
ASO (Original Skyrim): http://www.nexusmods.com/skyrim/mods/81221/?
ASO (Skyrim Special Edition): http://www.nexusmods.com/skyrimspecialedition/mods/9111/?
Tetrachromatic ENB: http://www.nexusmods.com/skyrim/mods/73848/?