Hi!
What started out as a school bust sculpt turned into a full character art project that blew out of proportion.
The project is Ryan Gosling, specifically from the iconic movie, Drive.
I am still looking to break into the industry and figured I needed more quality portfolio pieces. This is another step in that direction. The journey has been incredibly long with hiatuses, other work and shifting goalposts but I'm almost near the end, I think!
As I learned a lot of things, this will be a journal for me to chronicle my process, for future me to reference when I inevitably forget. It will also be for me to talk about some of the issues I faced (and some solutions I found) that I hope other people can chime in on. I hope to learn from others!
Actual progress:

Thanks for reading.

Replies
Chronologically, it's a mess, so I'll try doing sections to make it coherent.
Starting from the beginning, I'll post the sculpt I submitted for school so we can all laugh at it:
Among many likeness Youtube tutorials, one technique I gleaned that worked for me was to rapidly turn on and off Spotlight to be able to sculpt the 'impression' rather than trying to match exactly the shape for every photograph or screenshot (though I see some sculpt masters on Youtube do this).
It got a step closer than where I began, but it wasn't enough. I then bought a face pack from TexturingXYZ, VFace #89 Oleh, and started texture work. I did basic noise with Noisemaker in Zbrush first. I then wrap the VFace model, projected to my mesh, took the textures into Substance+Photoshop, and painted, layering on stuff to get more variation. I knew Ryan in Drive was a very tired man since he always worked night jobs, so I went a bit heavier on the eye circles.
Zbrush evolution:
Thanks to JHill's Youtube videos, I ripped out eyes from Metahuman, roughly adjusted their eye shells to fit my character, and placed it in.
Unreal evolution:
The rightmost sculpt stage in the Unreal shot above is around the 1/3 mark of the changes I made since.
Also, you can already see it above, but I will circle back to hair at a later post.
TL;DR: Sculpting likeness is very hard. Even after this process I can only hope I got better at it.
I think that's it for now, I'll probably talk about clothing next.