A world that has lost all of it's color there is a box hidden that has a magical brush that contains the Six Keepers of the Colors inside it. If the person who opens the box finishes the missions of all the six spirits it can collect the six colors they represent and give the world back the colors it once lost.
But these missions require the person to be strong, smart, creative and most importantly see more than the human eye is used to seeing.
This was done for Lightbox Expo: Box of Mystery challenge on Artstation.
The whole thing can be seen here: https://www.artstation.com/contests/lightbox-expo/challenges/83/submissions/50485