Using Topaz Gigapixel AI, OCO2 or Oblivion Character Overhaul textures have been AI upscaled 2x there original resolution resulting in 1K/2K and some 4K textures.
Requires
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Oblivion Character Overhaul version 2 https://www.nexusmods.com/oblivion/mods/44676
Tools
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Topaz Gigapixel AI https://www.topazlabs.com/gigapixel-ai
Optimizer Textures (Ordenador) https://www.nexusmods.com/skyrim/mods/12801?tab=files
Bulk Rename Utility https://www.bulkrenameutility.co.uk/Download.php
reaConverter Pro https://www.reaconverter.com/
Credits
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nuska - OCO2 version 2
ShadeMe - OBSE development and Blockhead plugin, without Blockead there would be no OCOv2
Halendia - Using the gorgeous Iridum eyes: http://www.nexusmods.com/skyrim/mods/30823/?
Exnem - HGEC resources
Robert - Body replacer compatibility resources
DaggerfallTeam - AI upscaling