Packaging Photography
Due to the necessity of adhering to the laws surrounding packaging. And the fact the layout of the packaging will usually have been predetermined by the creative and marketing departments of the company. This seems to be the most restrictive form of food photography. Compared to the other styles, there is relatively little creativity involved in the whole process. You simply have to be able illustrate the contents of the package, and, make sure you don't imply the inclusion of extra ingredients, or other unrelated items, (though common sense would dictate the 500g pack of couscous doesn't contain a full place setting, or dining table!)
Advertising Photography
Lisa Adams Photography for Food Lion
Although you'll usually be working to a brief. Advertising photography allows you much more of a free rein than packaging does. You're still constrained by the need to illustrate a product or service accurately, but you can do this in a much more creative way. Whether that's taking the products out of context, but staging them in an artistic manner (as above.) Or putting them in to a realistic situation, like a family dinner, or restaurant, and using a swathe of props.
Editorial Photography
Editorial photography is the most unrestrained form of food photography. It can be created for a publication, a website, or just for the hell of it (not very good business practice that last one though!) The purpose however is simply to make the food look amazing. This can be achieved through the application of a narrow depth of field, high/low key lighting, or by focusing on a single abstract element of the creation (merely hinting at the shapes and colours.) Ultimately, you want be people to be fascinated.
My work with Sabrina will be a mixture of both advertising, and editorial photography. The photographs will be used for decorating the shop (editorial.) And, as a means of conveying her range and ability (advertising.)