Many years ago, when I first began doing this (mystery shops and their related work), I took my photos with my digital camera (before that it was scanning the receipts when I got home). I would review the photos on my camera with its review button and make notes for that shop on a blank sheet. Then I would move on to the next shop, the photos saved on the camera's chip. When i returned home, I would download everything into my old home computer, using dialup to send them off. I was a terrible shopper, making multiple mistakes, feeling the wrath of the editor(s) of each MSC I worked.
Someone on this forum, who was more knowledgeable about this business remarked about creating a "cheatsheet" or in my mind, a worksheet. I also remember hearing talk about laptops, bringing them along on the shop, downloading the photos into it.
I followed that advice.
I created worksheets specific to the shop I would be doing. Because I could not afford a new one, I learned how to repair laptops, purchasing used ones on EBay and repairing them. I had several as backup. I bought an AC adapter to plug into my car's cigarette lighter for the laptop's battery to remained charged. Whenever I could, I began reviewing each of a shop's report questions prior to doing the shop, tailoring my worksheet to the report and in bold, the photos required. A lesson from a cop about not leaving a traffic situation until everything was reported taught me to stay onsite, reviewing my photos and filling out the worksheet helped tremendously in becoming a better shopper.
Most importantly, I learned how to make my shopping enjoyable and fun, listening to audiobooks while I was driving and stopping off at interesting places along the way.