Give each image a stable point of comparison
Place the same reference swatch or label card near each sample when taking photos. The purpose is not to declare a material result; it is to make later visual comparisons easier when lighting, camera angle, or the sample arrangement changes.
Record questions with the image
Write down what you are checking, such as edge clarity or placement, and keep the observation separate from a sales claim. Review /updates/ for other ways to make sample records more useful.