You sure got some unique shots on that walk, despite the overcast sky. I've been trying to choose a favorite, and am going for the third photo, with the second photo coming in as a close second, just because it's so different. What fun to look straight down on a tugboat! They were a part of my life when I was a child living in the Columbia River Gorge. But I never got to look down on one from above.
Thank you for the feedback, selecting your favorite. I'll look for more minimalist and abstract shots now. Looking down on the tug is almost like touring one. A tour would make a good photo post too at some point.