Suggestion: next time you do nighttime photography, use a tripod (you may already have used one, I can't tell), choose a small aperture (!) (like in f16 or so), which will automatically lead to looong shutter speeds (hence the absolute necessity you bring a tripod), and if you don't have a remote release, put the camera on timer so that no one and nothing with touch it when it starts to expose.
All your photo will be sharp plus the light sources will look more "precise" (and like stars, too), and a lot less like light "blobs".