that does not look like an tug.
look at
http://www.shipbucket.com/Real%20Design ... 0LINGE.png
http://www.shipbucket.com/images.php?di ... terdam.png
to say short:
way to large
weird hull shape
too large crew
armed!
and I really don't know where you would need an ocean tug for. for tugging damaged warships back into the harbor?
also, keep in mind that your harbour tugboat is already larger then the dutch seagoing tug. ok, it's not oceangoing, but tugs aren't supposed to be the size of the ship at the other end of their line.