I absolutely love the colors and how the look of the sky came out. The stars look wonderful. The only issue that I can see is the trailing black parts at ground level. It's unclear what they are meant to be. I totally understand not wanting to try and mess with it at this point since the rest of it looks amazing. You could try and turn them into something else, or else make them more a part of the landscape, but you run the risk of damaging the finished piece and how it currently looks. All in all great job!