This is what I have so far. I’m going to be entering the BlenderGuru Contest.
Next step lights and presents 
The ground looks really cool but not really like sand, more like small bubbles.
As you I’d work a bit more on the palm tree.
Here are some textures that might make it a bit more realistic:
https://www.poliigon.com/search/recent/narrow/list/palm
And the ground looks really cool but not really like sand.
You could work on that.
But overall I love the idea.
Hope this helps, cheers! 
Love the picture, looks great!
shifting the sun a little to the right (and a little down) and you will be using “rule of 3rds” Which might help:)
Thank you both for the ideas. Here is the image updated. I adjusted the tree and sand texture. Also I raised the sandy dunes a bit at the back. Thanks once again
