I think this still from what appears to be a Technicolor print probably captures what the Tarkin shots should look like imo (aside from too mucg green), and which ended up being the main reference source for my latest regrade:
Bluray regraded:
In think each frame needs a certain amount of depth for the shot to be photorealistic. There sometimes is a tendency to try to keep too much shadow detail at the expense of that elusive photorealism. This is another reason, why I always start the regrading process, by matching the bluray to a film still or print scan, to try to recover the depth, that originally was an integral part of the shot, like color nuances that are in the actor’s faces. These color nuances add a sense of realism to each frame, that’s completely missing from the bluray, and very difficult to recover manually imo.
I agree with Harmy that my first attempt was subpar in many ways, but I think the next comparison of his adjustment in photoshop, and my second attempt, reveals there are more color nuances hidden in the bluray frame, waiting to be recovered 😉: