The image is technically correct, but it seems to be lacking subject, or a focal point. There doesn't seem to be anything that draws my eyes into the photo.
I feel you could have improved this with emphasis directed towards the structure rather than a middle split reduce the pebbles to the lower third, good luck
I like the strong lines of the top half of this photograph, but I find the rocks to be.. a bit distracting, especially where the light is shining through on the left side. I think this could have been improved by leaving less of the rock visible - i.e. by having the bottom of the bridge take up 3/4 of the photo instead of half, and by cropping to leave out the highlighted stones. Still, this has a lot of potential with the strong lines and nicely exposed shadows/highlights of the bridge. Good effort!