How to identify the iOS version from the Hello screen?
Over the years since iOS was released, the opening Hello wallpaper which greets a user ready to set up the device has changed in several ways, most of them cosmetic. If each released major version had a subtle change to the Hello wallpaper, it would be easy to figure out which version of iOS was installed, but alas, the changes were few and far between.

Using Apple Configurator 2 you can see the installed iOS without going through any of the the setup steps: