Happy to be part of this project, Snyder cut.
I was the facial modeller for the Snyder Cut Martian Manhunter. This was a challenging project, at the beginning, the idea was to use Greenlantern for this final shot but as you may know this change in the last moment for this character ( he was just appearing on the transformation ).
I used zbrush and Maya and when I created all the facial coding system shapes, this was added to the rigging and triggered by the actor performance using software like face ware.
here is an article explaining the process.
https://facewaretech.com/blog/facial-motion-capture-on-zack-snyder-justice-league/