The absolute best time to make night images is 20 minutes after sunset.
#1 is tilted to the left a fair amount but the slow shutter speed works well.
#2 to close and way to busy for me.
#3 agree the red sign and it's reflection need to be cropped out and having the horizon in the middle of the frame decreases the tension in the image and weakens it.
#4 needs the white balance adjusted but is ok compositionally.
#5 again to busy for me and the overexposure seems a mistake.
#6 I think would have looked better from a higher perspective, like with the photographer standing on the roof of a car.
Six images is a bit to many to post and hope for more than just quick comments. If you do 1 or 2 at a time, people will send more time.