Structure
The structure of the genre really varies based off what the artist is trying to do. Sometimes it’s just a beautiful piece of work used mostly to convey the theme of the game and inspire the developers, known as an illustration. These illustrations are known as promotional art and are created with the purpose of getting hype of the game up. Other times it’s a multitude of crude sketches trying to hash out the ideas of say, a character of the game, colored over with a variety of notes on how they should proceed with the idea. Sometimes, it’s final character sketches with creative writing specifying who the character is and what to have in mind when developing them.