You cannot argue with pictures.
Even in your personal life, the first thing you ask for is a picture - Hey buddy can you snap a quick picture and text it to me from your Smartphone - That is the first thing we ask, anytime we need a proof of something.
For example if it is for an order that shipped, send me the picture of the shipping label.
If it is for a product that is received damaged - send me a picture of the product.
This entree is great at a restaurant, send me a pic so I can order it next time.
You cannot argue with pictures - Pics are worth 1000 words.