Waterboy
This starts to look really nice. I like the whole scene. Indeed as Venom already said is that though the bridge is weathered it looks still a bit too clean. The rust streaks are very good. But due to the rain and other weather you`ll see vegetation growing between the stones.
Also you might think of adding dirt like leaves or even a paper in the corner where the road goes to the stone where the railing of the bridge is on.
I really like the way you made this plant climb up the bridge.
Great job dude I like to see more