Night time shooting can be quite tricky. Basically you need to use the lens at its largest aperture (lowest F number) and longest exposure time you can get away with. If you have a tripod sturdy enough for the camera you are using that would be very helpful, but I think even better would be a wireless shutter trigger for night time photos, or whenever you need longer exposure times, because pressing the shutter button will cause a slight movement anyway, and that makes photos blurry when increasing exposure time. Also ISO number, the higher the better for pictures to be brighter, but that decreases the quality of the image, so you might need to compromise there. But... I think you actually got all that figured out, judging by the pictures you have taken...
Well. keep taking pics I surely am curious to see the surroundings, most of them look good...