what exactly do you mean with relief shading?
Just the angles of the different surfaces shaded lighter or brighter to highlight the relative angles. Might have expressed that more clearly, I guess.
The first thing that jumped out was the mast lookouts. I imagined they were round, but they look hexagonal from the top view of the plan posted above. This means that, seen from the side, it should be split in three parts in different shades, light to dark from right to left.
The bridge overhangs holding the boats could probably use something to highlight the struts in the girders, though I don't know how it looks like from close up.
It would be nice to use some shading to highlight the cutout in the hull near the bow, but I don't see how that would really work and still look natural.
_________________Soviet Century/Cold War 2020 Alternate Universe
: Soviet and other Cold War designs 1990-2020.