There are many differences from food photography for marketing and food photography for art. Food photography of art is more of a calm photo as the food is introduced with other items in the art. The art work is usually not focused on the food itself it’s just something that enhances the photo. Now with food photography in a marketing stand point the whole photo is focused on the food and barley anything else as your trying to sell the idea of the food you are presenting. Both are works of art I personally like the art version a little more as it includes  other props and items most of the time.