Well based on yr initial night shot, it still looks good if that's the kinda efx or night scenery you wanted to capture. It's really all up to you as the photographer yrself to decide what you want and what you're looking for in night photography.
This picture portraits a certain mood and climax at the time of shooting which probably appealed to you in a way. I assume it was taken after mid-night? The building lightings will switched off at mid-night. Correct me if I'm wrong.
You can take another shot with all the building lightings on, with the following camera setting - Manual mode, Aperture at f/11, Shutter Speed at 10sec. You can even use smaller aperture and you'll get some star-burst efx from all those lamp posts for dramatic efx so that yr night picture will be more lively. You can invest a little money on HOYA filter like Cross Screen (4-cross flare), Star-Six (6 pointed light flares) or Star-Eight (8 pointed light flares). Always avoid strong lights like spot-lights and flood lights in yr image.
Since you're using 350D, make full use of yr camera functions i.e. shoot in B&W mode. You'll be amazed by the end results it can produced. Try 2 shots with the building lightings on and off. From there you can compare all 4 shots (2 colors & 2 B&Ws).
BTW, try a wider angle and a different perspective for capturing architectural buldings. You can concentrate on the left side building with the dome. It's the Supreme Court and you do wanna make it look superior and grandeur, don't you?
Hope my 2-cents info helps.