Hi, Strela. We seem to be always drawn toward repetitive elements such as these, but it is a very difficult subject with which to make a good photograph. The reason is that the first several may be in focus, but then the remainder of them will not be in focus.
Firstly, be aware of extra elements in the frame, such as the railing in the foreground. If you cannot hold the camera horizontally, the horizon line can usually be corrected in your computer. (or in some cameras) If you have the time, put your camera on a tripod, and stop down (use a smaller aperture) to increase the depth of field. This will help keep more of them in focus. Play around with the focus, and see what happens if you focus on the second unit, for instance, to see if more elements are in focus.
Also, on overcast days the light is probably not what you need for proper exposure of the darker areas. Learning in film, we learned to bracket our exposure in the hopes that one will turn out with the correct exposure. With digital, you can usually do the same thing in the computer later. Since you have chosen to make this image in B&W (a good choice), you can also try different filters when messing with it in the computer.