|This is the clear winner of the three. I am mixed about the strong backlighting though. On the one hand, it's different and interesting that way. On the other hand, it seems to dominate. I think some other processing techniques might help to emphasize the bridge, if they are allowed in the contest. For one thing, you could try an "old time" treatment, allowing the edges to vignette with "age".
Anyway, it's hard to see a solution without playing with it, and it's actually nice as is! So when you are satisfied with this one, it's ready for entry!