Nathan describes creating a background for a game by using a solid red color and burn tool to darken the sky and add clouds, noting that using a gradient would have looked better as the reflection line dips in some places. He also details copying the basic outline of a skull from an image and adding color, shading, and features to match the game's theme. Additionally, he discusses taking a character from Google, using brush tools to draw pixels, shade, and add color to make it his own style. Finally, he mentions adding a non-functional health bar for detail that he would like to animate if revisiting the project.