Hi John,
When set to Medium, the images were too grainy to read handwriting on forms, gauges, serial numbers, etc. I set it to Large and it "seemed" nominally better although I am still trying to get the exact same photo at the exact same distance to compare apples to apples as I write this. Unrestricted did look better. However, my survey blew up after I took the picture before I could submit it. I was using an iPhone 6. I did get the message when I brought the app back up (it was running in the background) and I was able to successfully submit it. I had surveys do this when I had attached many photos using a Medium size, and also when I had answered a boatload of questions while testing. Have you seen problems with the survey crashing due to Unrestricted image size?
Thanks,
Shana