It was first pointed out by Shin-Ra in the Cinematic Trailer thread
This is really cool! I always felt there was something about her mouth that made it look more realistic than I expected. I think it's just simply that it's imperfect.
The reflection in the eyes is really cool, too. Do we have multiple examples of this in-game? I wonder how realistic it actually is.
As seen in the skin pore pictures, I really like the soft rubbery lighting this game has. It unfortunately makes everyone's neck look a little weird.
What has really sold me on the graphics of this game are the animations. Some examples were posted in OP. It really makes it feel like I'm interacting with a world, not just creating cause and effect. A major take-away for me was the movement. In a game like Assassin's Creed or Witcher 3 (or many others), when you start to move forward, there is a little wind up animation for the walking, then the movement animation, and then a stopping animation. They do this so that the character looks more realistic moving. And it works... so long as you actually plan on moving. If you are just nudging yourself forward, it ends up looking very awkward. Then you have games like MGSV that favor precise movement. The animations are great there, too, but they they are only exactly what they need to be. It's hard not to be reminded you're playing a game when you play MGSV (I don't think this is bad - it just is what it is.)
Horizon seems to give the best of both worlds. Aloy feels incredibly responsive and, in my limited play time with the game (so many good games out right now...), I have had zero control issues. At the same time, she moves and interacts with the world so realistically. Even the infini-roll looks great despite being one of the most gamey things, because the end of that animation sets it up so that she can spring back up into standing, walking, running, or rolling again.
Anyway, it's hard to put into words because it's actually a thing that effects the game in a huge way, but I'm at work and can't make my own videos or go digging for any right now.
I'm just really impressed with the way the game blends its animations with the controls.