I choose this image because of its realistic representation of a Mc Donald's hamburger. It really looks like a real Big Mac without photoshop retouches.
Concerning the design:
It is balanced since there is text at the top left of the poster and the logo at the bottom right which create an equal distribtution of elements. The focal point is the the hamburger by itself since it is centered in the poster and enough colored. The black background gives more contrast and puts the hamburger more in importance.