The main outline is to have a mosaic of food creating the bigger picture of a man placing the last piece(s) of the mosaic onto his body (perhaps his head, leg, or arm). The idea is that the whole foods are completing the man, that the food is what makes up his body, and that he is taking this act into his own hands. Perhaps in a valley with a mountainous landscape (if this is done, it should be a separate layer from the character itself). The foods can be any combination of the following (strawberry, half sliced avocado, bell pepper, purple cabbage head, half sliced orange, blackberries, lemon, spinach leaf, tomato), the picture doesn't have to be composed of all of these, whatever feels best, and works best for the picture and colors.
I'd like it to look more realistic and detailed than cartoony, but it can't be grim or too serious; I want it to have a homey and pleasant appeal.
Conceptual sketch is fine to begin with; I will look through your history for an idea of your styles.
The final product must be a Vector file, this has to be scaled up onto a truck, and if there is a background, it must be a separate file/layer from the character.