A couple of details. The pintles and gudgeons on the rudder would be iron or steel and look to me to be painted black. Painting ferrous material is of course necessary under water, and would also serve pretty well as a galvanic separator from the copper alloy plating. On the museum we used marine grade stainless steel fasteners.
There's a strake or a stringer or a swale or whatever down about three plates from the top, at the 17 foot depth mark. From the pattern of the plates it looks to be applied over them, and painted black. Squinting at the model shot, I can't see it molded on there, but it's an interesting detail. It also looks like the hull shores come up under it, but I doubt it was put there for the shoring, more likely the shoring was fit to it. (?)
The very front edge of the bow, and I have no idea what the term is, breakwater?, is blackish. It looks soft though, like copper or brass, just in the black stage of oxidation. The bottom of the keel looks black too.
I've found a grand total of one photo showing the plating on the victory, as she currently sits, and it appears light green, which is predictable since it sits exposed in a salt air environment.
One last comment, and not to insult anyone. Having been a modeler for 40 plus years in a serious way, I do not tend to use other peoples models for reference very often. Certainly someone like Longridge is beyond any reasonable doubt, to put it mildly, but I'd rather read his book. And to follow that logic, there's lot's about his model that are not "as-built" but are rather done for effect, or to better show how something is put together before it's hidden under multiple coats of paint.