By using the tomato as the Heinz "bottle" you know that their ketchup is fresh, and straight from the source(tomato). Also it ties into the text because they are differentiating themselves on having the freshest, most natural ketchup made out of tomatoes, which happen to be the bottle.
This is so simple, but such an effective advertisement! I love how the creator used the product to show that it's for at night by creating a moon with the lotion and its container. This is the type of thing I hope to accomplish with my degree. 31 Really Clever and Creative Print Ads