For long exposure night shots you should try to keep the ISO low to keep the noise levels to a minimum. Noise will really kill detail in your shots.
Were you using a tripod? From the shutter speeds shown in the exif it looks like you were.
And if you use a higher f/stop value (smaller aperture opening) like f/11 - f/16 you'll get a nice starburst pattern from the streetlights instead of just being blobs of light.
I like the compositions in the last two shots. The second shot has potential but the rubbish can and the empty black area of the top reduce the visual impact for me. Try this shot again but maybe from a lower point of view. Try it with the camera in the portrait orientation too.