Marty Aexel created a poster over several iterations to promote a western-themed steakhouse. Each iteration involved changing design elements like the title style, background color, and effects like flames based on feedback and ideas. Marty learned new skills like adjusting layer levels and opacity, adding textures, and using tools like the eraser and pencil. The final poster features a torn, aged look with blurred text, bullet holes, and other effects to capture the intended old western aesthetic.