Nice capture. There are all sorts of pictures available in the night sky. As for ways to improve I would suggest framing being the key thing to work on. Either have more foreground so that it becomes interesting, or do just a star field shot with it in it. If doing a star field shot having the milky way or other astronomical objects in it adds to the picture. In both cases a 30 second shutter speed works reasonably well if you are shooting at the 18mm end but to get better pinpoint stars consider using the rule of 300, basically take the number 300 and divide it by the focal length you are shooting at and that is your maximum shutter length. If doing a star field think about upping the ISO as you will be able to get dimmer objects, so try ISO 400 ore even higher then stack the images and blend the ISS in the correct position.
If you like shooting the night sky I would also highly recommend getting a Hoya red intensifying filter for the lenses you use, as they are the poor man's light pollution filter. This will remove a lot of the sky glow you have, especially in the lower left of the image. Having that filter on will also enhance the contrast and details in dim astronomical objects that would otherwise get washed away with the light pollution. For images of the night sky editing in Photoshop or GIMP you will be able to bring out more details than Lightroom can but it takes lots of practice to get good results.
A while back one of the guys over in the astrophotography group grabbed a bunch of shots as it traveled over head hoping to get a reasonable still of it. Here is
the thread about it. Pete was using a 910mm f/7 telescope for the individual shots with it in burst mode at ISO 1600, and 1/800s.