If you can't find them here, I don't know where: https://sims-2-sliders.tumblr.com/
I think this page lists all the existing sliders.

Also, I already told you how skins work, and they can modify the nose shape a lot with texture alone. Perhaps they also used a custom-made face preset, without saying it for sure (but again, face presets can only work with what's already there, so you should be able to get a similar result with sliders).

Maybe ask the creator of this particular sim which sliders and skintone they used.

There's at least 3 different for the nose, including one for nostril rotation if you scroll down a bit (there's at least 5 pages). Maybe try them out.
Also one here: https://withlovefromsimtown.tumblr....t-1-i-have-been
And here: https://crispsandkerosene.tumblr.co...ble-in-both-cas
And here: https://simnopke.tumblr.com/post/15...0707/20-sliders

Lipstick and lip sliders is my guess. It's not like it's completely impossible to make these sims ingame.

I rarely if ever make any makeup or skintones or face masks, but I'm pretty certain it's a texture effect (face masks and lipstick are just variants of makeup, and work as overlays for the skintone). Some people hand-draw these effects, while others will download a picture and use this as a base. Can't tell which method the person who made those lips used - you'd have to ask them. They probably used Bodyshop and a picture editing program (like Photoshop or Gimp).

100% of face effects in Sims 2 are either done by tweaking face presets and sliders (defaults or non-defaults, or some sort of direct face edit for the more advanced creators out there), or via the skin or skin overlays. There is no other "magic" method.

Like I said, it is a variant of makeup. There are probably tutorials in the Modding section. Maybe open the file up in SimPE and extract the texture so you can see what was done.
Not going to make a makeup tutorial for you.

(In response to PM) I've never used the FaceGen program before, so I'm not the right person to ask. You seem to be trying out at least 2-3 very different methods of editing faces, and I'm not sure you're getting anywhere with that approach. Perhaps settle on one of the methods and post your questions related to that particular method in the belonging topic, instead of mix-and-not-matching them.

hi, i know this tutorial is super old but figured i'd ask incase anyones still around with more knowledge than me!

i'm a little confused on the mesh tool section of the process: if i use the edit existing mesh function, the saved GMDC file seems to either break and not change anything in bodyshop or just be the unchanged preset. meanwhile if i use the create new mesh function theres no option to uncheck UVs and normals, so i get the eye glitch. which am i supposed to be using and what could i be doing wrong?