My first thought was that it looks like you have used an ultra wide-angle lens which has made the top third of the picture uncomfortably empty, a slightly longer focal length would have cropped that away.
Maybe full on b&w would have been better, not sure the bit of blue works
Also might have got all of the closest section rather than have the diagonal end without connecting
Nice and symmetrical though and I like the low view you have got.
Just my opinion, not an architecture person either, but can see how it would appeal
Where is it?
Is it Docklands?
My thoughts are it's a good attempt and you should shoot more architecture.
My observations are you need complete symmetry. You need to be completely in the middle of the bridge with the camera perpendicular to the horizon and straight on x and y axis.
Your level but I think you're off perpendicular or not quite in the middle. There is a slightly skewed feeling to it but I like the idea.