So,
The artbook mentions some more ship customisation like the Brig, some hammocks, etc. etc.
But wouldn't it be nice if we could actually change the interior of the Captain Quarters? Let's say, the Rug, the Chair, the Floor. Just like the HMS Victory had a tiled floor instead of just plain wood, how some ships had white walls instead of brown. The chair in the Captain's Quarters should also be backed up a bit and should be straight, so the "Captain" of the vessel can actually do the sit emote on it.
I think it would be fun to see a tiled floor cost more than maybe just another color of floor, or a Gold with red Admiral chair, so players can actually have more cosmetics to spend their money on.
I think players would like more ship customisation to stand out from other players.