im a novice but if it were my shot, i would photoshop out the guy with the green jacket, or at least desaturate the colour, i feel its distracting with the tonal values in the photo
i also really enjoy the mood of this shot, keep it dark, it is a hanger!
i like the shot as a whole, but an alternative... i think if you were to crop the shot so only the bridge was in frame it would also stand on its own. since the bring appears to much more grand in this shot simply because of the castles distance from you, i feel its a struggle between the bridge and the castle as to which is the subject.