GALLERY TIP: If you're viewing the gallery images on a smaller monitor, press F11 on your keyboard to maximise the browser window. You'll then see the images open much bigger when viewing full size.
If the bridge had been "corrected" for height by dragging out to make the top and bottom parallel, it would have had a knock on effect on the width of the girders, which would then be themselves distorted. You can't win in this situation; you either take great care to get the camera back vertical and parallel to the bridge or you get some departure from mathematical exactitude.I don't know why camera club judges pick up on this; from what I've read (never having had any personal experience) they probably can't devote enough time to an image to make a reasoned assessment, and need some quick and easy rules they can apply regardless. On one forum, I recall a judge saying that even if the club gave him the opportunity to see the images beforehand, to prepare himself, he never took it; preferring the spontaneity of a two minute chat to being thoroughly conversant with the image and perhaps working out why the photographer did it that way. Usually, it's easier to assume that the photographer got it wrong, than to take to time to ask why they did it that way.