IMO, the island (or land) on the rights seems like is floating upon the waves and the tones are not correct. Besides, the palms on the left are too tiny and blurred, whilst the island should be out of focus, according to sea. Finally, there is no high-res to see more details. I think that with some adjustment it could be better!

Beautiful scene, very relaxing.

while i think you have created a nice scene, i agree with rusvelt. There are masking issues on the palm trees, and on the "island". i never suggest using a wand to mask out your objects. the pen tool is the most precise tool to use. yes it takes some time, and your eyes start to hurt, but when it's done the lines are clean and perfect. there are many tutorials around about proper masking. good luck and have fun!

The people look huge compared to the palm trees on the left. Maybe make the palm trees larger or the people smaller. Good luck author.

Nice mood and colors