Set the opacity of the blurred noise layer to about 50%.
This is what you got so far…
Flatten the image.
Select (manually), using the marquee tool, the lower part of the canvas (“water”)
Go to Filter >> Artistic >> Cutout and apply these settings for the cutout effect.
Remember, we are making a painting, it should look as it it was made using a brush!
Now (while your “water” is still selected) go again to Image >> Adjustments >> Hue / Saturation, check the “colorize” box and make the water a bit greenish…
Create a new layer. Using the round brush (with sharp edge), go over the horizon line that separates water from the sky, as shown below:
Select the eraser tool and remove everything that was below the water line, see pic below:
Make a new layer again, select a sharp round brush of a huge size (about 200px) and make a stamp on a place where you intend to make your full moon.
Go to Layer>> Layer Styles >> Outer Glow and apply glow using the white color…
In your layers panel, select the background canvas (where we have the sky and water) and apply this lightening effect from the center of the “moon”, but not on the moon’s layer!