Ooh, that’s a really good question.
If you’ve got an e-commerce site, do you need one photo of a product or several?
OK, first up, your site style may almost dictate the answer, if the bulk of your products are single, then continue in that vein, if the bulk of your products need multiples, stick with it. I think inconsistency on the site is more an issue.
Secondly, are your presenting “advertising” shots, i.e. your expressing a lifestyle, feeling or whatever, or are they true “product” shots so the buyer knows what they …