deepfakery
Can you say which tutorial you followed?
Your source faceset needs to have blinking eyes in roughly the same pose as the destination faceset. So if your destination is looking to the left and blinking you need to have something similar in the source faceset. If you are doing a custom xseg mask make sure to label a variety of faces with open and closed eyes in both sets.
During training make sure you have random warp enabled for a sufficient amount of time. If that is not enough you can enable eye and mouth priority as well.