Man, it took me all this time to get what was the problem with glitched textures when the mod jumps to the main game.
It's because the nymph and vanilla character mesh had the same name. It seems when making character replacement mods its best to change the name of base mesh and textures or to use a different folder for them. It's more work, but prevents any kind of glitches or conflicts with the main game.
The mod will be updated soon, when i finish relinking everything.