I honestly don't want to stir up any trouble here. Just something I think the site admins may consider. I approach this from a purely photography point of view. I don't care what ship is in my viewfinder, as long as I have something interesting to capture or present it in a way that makes my audience smile.
Could a general category be added which would encompass closeup/detail shots? No sub-categories inside. Just detailed shots of any vessel. I think this would bring a new dimension to the fine marine photography on this site and enable us and our audience to see things most don't, especially when our subjects tend to be quite a distance away from us and many will never set foot on the decks of the ships we photograph.
The aviation community faced the same issue when for the longest time some of the foremost aviation photography sites also disallowed posting of close ups, and yet with the advent of social media, sites like FB and IG now find these types of shots to be very popular.
Just a humble thought