WAIT!
This model is useless... Unless used for close-up portraits or with FaceDetailer/inpainting. This model will not improve the eyes in a wide shot with distant eyes! I repeat: Only for close-up portraits, FaceDetailer, or inpainting.
So, when should you use the model?
During upscaling (improves, but isn't optimal)
Using FaceDetailer (works well)
With inpainting: manual or automatic segmentation of the eyes (best results)
Tips:
Works better by inpainting both eyes at once than a single one (risk of asymmetry)
The amount of denoising required will depend on how badly the eyes are drawn and the resolution of the inpaint mask:
Badly generated eyes and/or high resolution (> 1024 px) -> High denoise (0.4 to 0.6)
Acceptable eyes and/or lower resolutions -> Lower denoise (0.2 to 0.4)