If this is the Chinese food place, you had two options. The requirements allow you to not wait for an out of stock item if the estimated wait time exceeds a certain amount of time, I believe it is 5 minutes.
What I did last time was, have them delay preparing my plate until the item I was waiting for was available. They usually offer me this option.
As for pictures, they do not out us as shoppers regardless of half full or even empty plates. The staff is oblivious to customers taking pictures. I plaster pictures all over several sites, mostly Yelp. I have never been asked about my taking pictures. I take menu pictures on a regular basis as part of my Yelp addiction. Plus plating, condiment stations, drink stations, general ambiance, you name it. Most of our mystery shopping pictures are less ambitious than typical social media posters engage in.
My posts are solely based on my opinions and for my entertainment, contact a professional if you need real advice.
When you get in debt you become a slave. - Andrew Jackson