Merge down the layers and apply after that a prepared brush that can be downloaded here: http://www.deviantart.com/deviation/9890582/
?qo=65&q=by%3Alarafairie-stock&qh=sort%3Atime+-in%3Ascraps
.

It is necessary for drawing the moon.

Unreal Night Photo Effect

Merge down again all the layers (shift+ctrl+e) and get to the window Filter – Liquify (shift+ctrl+x) to use Bloat Tool for distorting a little the castle (the instrument must be applied with short pointed motions).

Unreal Night Photo Effect

Represent on a new layer now a rounded element, using the Elliptical Marquee Tool and clicking on the shift button, paint it partially, selecting the Gradient Tool.

Unreal Night Photo Effect

Change the layer's type on Overlay:

Unreal Night Photo Effect

Draw the same way one more circle, but this time it should be smaller:

Unreal Night Photo Effect