Two guys logically explain why The Boss, a middle-aged war veteran, does not look like a 20-year-old e-girl
Gamers: Well she should look like one anyway
I'm so tired 
It's so fucking stupid, she looks pretty much exactly like the original character but in a photo-realistic style
Holy shit, I somehow missed the most unhinged comment:
[CW: Transphobia]
spoiler
They made the boss look trans and that's a fucking crime.
The chin is different, it looks like a man's chin, the mouth is different, it looks like a man's mouth, more specifically it looks like Chris Chan's mouth, don't believe me, go do an image search. Neither the mouth or the chin or the brow or forehead or zygomatic process feminine in any way in the remake version.
The boss has deep cheek hollows because they changed her maxilla as well, literally everything they did was to make the Boss look like a ******.
Their brains are so fucking cooked
I don't see why you have to shift the artstyle in the first place but even removed from that I don't think this counts as anything near a faithful adaption of the old face. This is a re-imagining, which can be discussed on it's own terms, but it clearly does not look like the boss anymore. Her not looking old I'm happy to blame on PS2-Era limitations because you either look like that or The Pain, the rest of it is absolutely done on purpose.
Photorealism is the norm in AAA action games. Looking at Kojima's recent stuff I'm pretty sure it's what he would've gone for too if he was making the game today. I love the look of MGS 2 and 3, but it is what it is (Not MGS4 though, the stylised anime faces with more realistic skin detail and rendering didn't sit well with me)
The Boss and the other characters we've seen so far don't look 100% identical to their PS2 counterparts but they're easily recognisable to me. Like I said, realistic human video game characters often get facelifts when they move between hardware generations
Why?
Because gamers will complain your game looks like Minecraft otherwise