Demonstration / Marketing photography, a quick guide: A product looks its best when it's brand new and in the hands of an attractive, but relatable, person, who is using the product appropriately. If relevant branding is present, it must be clearly visible and a dominating element within the composition. Pictures must be bright, colorful, clean, and show the product in its entirety. Do not risk associating the product with unintended uses or negative connotations.