First I made the background, I really liked this effect from the brush, it's kind of a old picture effect of some sort. The colors was selected to resemble to sunset, as the sun going down, and the colors beign more dark and blue on the top.

Then I proceded to insert the details of the cover, since the beginning the moon would have a big role in the story of the game, so was natural that it had an appearence on the cover, next I wanted to add the main character looking at it. At the time, I didn't have any draft for her so I choose to draw her backwards, and last, I wanted to have the ground reflecting the shine of the moon, and then added this effect of ground that kinda resembles the clouds.

Last, I added the name and subname of the game with a font that I think matches the kind of game I wanted to create.