I would agree that now that you seem to have the exposure settings figured out, to work on composition. My first night sky photos I was just excited that I got some stars to show up, but just like other types of photography it all comes down to composition. Like what EOV said, I'm not a fan of the powerlines. There's this lighthouse that we'll go to sometimes because it's a very dark spot, but the actual lighthouse is on an island just offshore and there are powerlines which go out there and it's difficult getting a photo without them in the frame- hate that.
Night sky photography is amazing and half the fun is just going out and learning, so have fun!