Generally speaking, it's the hair not fitting quite right. You can bump the hair up or down a little, and it helps.
Sometimes it also matters how far you are from 0,0,0, with things occasionally getting weird when you're thousands away from 0,0,0.
Sometimes it's lighting, and adding another spotlight pointing at the affected area, cranking it up just enough to get some more light in there but not be noticeable will fix it.
And then sometimes you just say "Fuck it" and do it live, by fixing it in post.
View attachment 977597
... eyework I did was shit, but you get the general idea. Shoulda cloned it from the other woman's eyes.
