Help ID-ing Model

Seems like could be a mix of Raiya morphs (frequent collaborator with OOT)

RY Adeline for Victoria 8 | Daz 3D
https://www.daz3d.com/ry-adeline-for-victoria-8
(also here)

And maybe some bit of...
RY Dallas for Victoria 8 | Daz 3D
https://www.daz3d.com/ry-dallas-for-victoria-8-
(also here)
...look like they'd be close if mixed, perhaps.

Possibly
RY Elysa for Victoria 8 | Daz 3D
https://www.daz3d.com/ry-elysa-for-victoria-8
...thrown in for good measure - which was another Raiya/Outoftouch collab released just prior to the promo in question.

Same char used in these:
https://www.daz3d.com/grunge-schoolgirl-outfit-for-genesis-8-females
https://www.daz3d.com/grunge-schoolgirl-textures-expansion
And roughly fit the same release timeline as Raiya.

Could try reaching out to OOT (outoftouch) on the DAZ forums to be sure.

That's the part that's often most difficult to tell. It could be anything.
Besides not knowing the morphs, unless a skin is tied to a known or verified character, the odds of discovery are low.

I always recommend trying to contact the original vendors through the DAZ forum. If you ask the right way (courtesy and compliments are king) you might get a very specific answer, complete with names of used morphs and inclusive of details right down to dial percentages.
Know that, however, a given artist might not reveal all their secrets (which is their right and their discretion). And that's all if it's not a custom skin/MAT used, too.

I meant contacting OOT directly via DAZ PM.
But looks like they are not necessarily available directly there. (Certainly not easily so.)

But you could try sending them a message at rendo, here.