I don't think it's necessary to include ALL of the items in the set in the first listing photo. In fact, from an aesthetic perspective, you're likely to get more views if you only include one item in the primary photo.
In this case, I'd pick either the ring bearer pillow, the garter, or the flower girl basket. Maybe even make three different listings, one with each feature item and see over a month or so how which gets the most views?