Food Photography today is very common and easy to  some of us that are highly skilled, down to some that what we may call a novice. I think from a professional aspect of driving sales, is the only thing that separates photography  for marketing from photography for art. They both may involve editing to perfect the end result depending on the intent. Apart from that they both need each to be as successful or outstanding. The form of art will naturally drive sales  or awareness, therefore I do not see much of their differences. As far as I see it, it is an art to be able to properly market anything, period. Just like the young girls that invented New Fork city, I doubt that they had a lot of marketing skills or even studied art as a major. It took very little knowledge and experience. All they used was an idea, and  because of their love for food or taking pictures of food, made it easy to express through pictures.To conclude, I do not prefer photography for marketing over photography for art because to me they both represent an expression of how one feels and how we envision food.