McDonalds uses color contrast in their advertisement. The colors yellow and red contrasting colors and are also their branded colors which creates a cohesive message that stands out to the consumer.
Jorgensen uses color, texture and font to create contrast. The colors and texture chosen stand out from the bright background while also creating a focal point with the unique illustration/texture. The fonts at the bottom differ from the one at the top which also creates a sense of separation and contrast with each other.
The M&M ad uses color and font to create contrast. The visual contrast with the plain white background with the ever so colorful M&Ms. They also use a script font with a serif font which creates that invisible but noticeable difference.
All advertisments use center alignment to create a focal point for the consumer.