Well, I've made some changes .....
I gave a bit of texture and colors to the moonlight
I have a doubt on the perception of the texture of the sand
Any suggestions on how they could get a little more realism?
Maybe you could use more momplementary colors in the shadows versus moonlight - like you do in the foreground and it looks the best part of the image so far. Some reds and browns give scenery some shape and also gives stronger feeling to the blues.