The picture is too small to read the name of course, but it's
deffinetly a ship belonging to the world famous "Smit" company who owns
tugs like the "Smit Rotterdam", "Smit London" and once called the most
beutifull sea tug in the world ; the "Zwarte Zee"
The tug on the pic looks like either the Rotterdam or London.
Neither the "houston" nor "New York" I am familiar with, so it could easily be one of those as well.