What I like about this poster is that it has a good use of white space. And lots of food. The characters don't need to be overlapping what draws the eye, and let you continue reading it after pulling you in. Very simple graphic design.
scale and proportion to create mood - use of large type to be playful. The large O's frame the faces in the design, making you focus on them. The faces are smiling creating a mood of happiness and playfulness.