Help designing a scene in Unreal Engine

Hey guys,

I wanted to create a night time level for a 3D game in Unreal Engine with an art style based on chinese paintings. The scene is set on the shore of a beach with a large moon the background emiting light that reflects off the surface of the water. The two images uploaded are examples of the scene I have in mind.

What is the best way for me to create an enviroment inspired by those images. The biggest thing that I am not sure about is how should I make the sky to look like the images sent.