Hi Jonas,
I would add to Robs comments, More buildings it is too open. Look at Langton's harbour pieces, I think it would help with the look of the dockside. If you are thinking of ships being tied to the harbour, Think deep water right up to the harbour dockside. Or add buoys a little out to sea and lots of smaller boat on the beach. I wish more would do as you have and make a safe place to rest-up in. Some talk of games of merchant ships racing across the board to escape. Why not into a nice harbour with big guns like yours.
Be safe
Rory