I would continue with it and see if I could add a couple more images that would ... explore the boundaries of the theme.
Thank you for your considered comments. This will prove to be excellent motivation for me to continue and expand the project, hopefully to distill half a dozen images.
I am enjoying working with colour at the moment, which the last two are essentially the key components. My initial feelings with the third image was to add some reddish tones to the dark areas, (it is a warship after all). But seeing as these images are primarily just colour in many ways, I opted not to edit them at all, so the last two are straight from camera. Any others made for this abstract theme may be the same. I think it makes sense to have obvious landmarks so the viewer can create the image in the mind to fill in the blanks of the abstraction. Landmarks on the thames with strong primary colours seem to be ideal as the river can give an anchor, and a telephoto lens can be used to help with the blurring effect. So, for buildings, Tate Modern, London Bridge, possibly the Millennium dome are all possibilities.
Image two is edited, and is a composite of two images, as the figure on the left is in a separate image. I'm happy with the result, and improved some skills along the way. I do have other interesting images of the Belfast (image 3), I will consider blending two bring more interest.
Thanks again for your comments. I look forward to posting more as they are done.