If the intent is to pop out surface detail, a suitable shadow contrast color can work better than pure black or black/brown (brown is good for wooden decks in natural colors).
Less is more here.
Ships are tough for this, too, as they will often have huge swathes of blank, featureless plastic which will hold no wash at all (unless yo use refernce photos and scribe in surface details, which takes a light hand as well.)
Scale effect is important here--viewing a 1/350 model at 12" is the equal to seeing the real thing from 350' away. There are a lot of details that "vanish" at that distance.
Which bring the next issue: Weathering. Naval vessels seldom go more than 6 months without a port visit, and every 30 days for more food is more typical. Ships operate in a rust-creating environment. If conditions are good, a portion of the ship's crew can be put over the side and repaint the hull in 2-3 days. As long as she's sitting still moored, at anchor or the like.
While underway, there are a few dozen sailors with the only function of seeking out peeling paint and rust, and correcting it. This is especially true from the main deck and up the superstructure especially around the bridge.
The masts and stack tops might get neglected at sea, but will nag as the XO until the next Port Call, at which point the Deck Division Officer will be assigned to set the deck apes to correcting bad paint.
This is part of the reason why warships seldom show weathering in photos. Warships also have excess sailors who need to be put to work lest they get up to mischief, too.
Merchant vessels are only manned to need, and are often beat up and rusty.