This is very well made,
The first thing I think when I see this picture is how much this picture feels like it's straight out of a dream. I like the idea of a conch shell being a floating island, a very creative and interesting idea.
Now as for the colors; I can easily say this is one of the most beautifully colorful pieces I have seen here. The palette of warm and cool colors blend together seamlessly. In fact one of my favorite moments is the sky, how the burning orange color is effortlessly blended into the cool indigo of the night sky.
In conclusion, a well made picture!