Update. 5th Dec
Muted the blue and red eye slightly as they were a bit too colourful.
Added plugin that adds extra eye colour options.
Green
Deep Red
Brown
Violet

I am a fan of Natural Eyes, and am using it with the elven alternative texture. The Orc eyes however don't look right. This is an eye retexture for Orcs only, that aims to give Orcs high resolution and more natural looking eyes, while maintaining the lore aesthetics.

While I already have an elven eye mod that include orcs, it's out of date and I don't think it's worth updating.

Installation.
If doing it manually, just extract files and drop data into the data folder in skyrim.
If using NMM, just overwrite the Orc eye textures when it asks.