Vessels alongside should be a little more relaxed on the rules when it comes to obstructions by such as cranes/barges/tugs and other assisting and service vessels.
Also direct bow or stern shots,, is it really necessary that the whole mast is visible and on the lower side the waterline ? Here as in others same problem,,where to draw the line where the picture is still acceptable to post.
The whole length of the ship in a stern/bow shot is a question worth,,,special if one allows not a full length, but then 50 % of length,,or must 70 or 40 still ok ? It will be a rather discussable point afterwards.
Overhang of another vessel should not be. Same as above,,where to draw the line how much overhang/mast/length, it will be a discuss point for ever and ever