There’s a deepfake video of Tarkin.
What I like about it: It does flatten out the lighting, which makes him look more natural. ILM went all in on subsurface scattering (I think that’s what you call it) and half the time Tarkin looks like a faintly glowing bruise under a flashlight instead of a sallow-faced person.
What I don’t like is that when you deep-fake a CGI creation, the mouth still doesn’t work, because the base you’re working from is fundamentally wrong. So you have the images of a real person trying to match the incorrect mouth movements of a digital recreation of that person. The deep-fakes of Carrie Fisher over CGI Leia have the same problem. Leia may look a little more realistic (only a little) and then she mouths the word “Hope” and suddenly she’s an effect.
I think cutting around Tarkin is a step sideways, at best. It doesn’t really improve things, because the conspicuousness of not seeing him calls just as much attention and pulls you out of the film just as much as watching his mouth not work right. Either way you’re drawn to him not as an organic part of the scene, but this artificially introduced distraction. It’s just a different sort of distraction when you’re constantly cutting around him.
I think the Tarkin effect is much better than Leia’s, though. Leia shouldn’t have seen in Rogue One. It doesn’t make any sense from a story perspective, and the execution didn’t make up the balance.