Interesting compostion. The inclusion of the foliage on the left is, well, unnecessary. Perhaps getting closer and making the s-curve in the bridge entirely fill the frame would have improved the shot. Also, you may want to explore bumping up the contrast a bit. The toning seems a little washed out.
very good use of lines, wish there was a little more detail in the trees on the south shore and in the upper left part, looks like it was rainy or overcast
this is a fascinating image. I love the interplay of the dark underside and near white of the pillars. There seems to be a hint of camera shake or blur in the image.
I think the persepctive would be improved if the upper (darker) part of the bridge flowed without interruption. Other possible improvements: use 1 stop less exposure and some sharpening. Not totally sure about the exposure as you might loose some under-bridge detail, but I don't think that would hurt the overall image, and may have the effect of pronouncing the lighter stone details more strongly.
I think the composition is excellent! I wish the photo was sharper, though...the background looks really washed out, which would have been fine if the bridge was bolder and fully captured my attention. It would have taken sharpness and maybe some greater contrast to do this.