A catch-up from me Dave, as I haven't been looking at other threads while trying to get my own up to date so you've added four since my last visit. Time flies!
Abundance is very effective and conveys the theme very well. You can't go wrong with a load of shiny things on a black background
and I think I just prefer the contrast and tones of the B&W version, although the warm tones of the other version also work well.
Heavy is simple and definitely effective in meeting the theme, and mono works well to concentrate the eye straight on the dial.
Wet - I prefer the colour version because of the lovely blues. The B&W looks quite flat and doesn't work so well for me, but both capture the life in the moving water.
Juxtaposition is a tricky theme, and I remember the debate when it came up a few years ago too. I think it's mainly about contrast and difference and you've conveyed that here with the male/female thing as well as a clear contrast in size and also the power aspect you mention in your text