Hi JanetCinNC!
That's a really good idea! For sure it's not perfect and the photo can be removed, as said above, but however, it's a way worth a try for the case you might lose your device.
I also noted the serial number of my devices and I'm going to add a sticker with my name and email etc. on it, but in addition to that it seems to me to be a good idea. And as I don't have any other pictures on the reader and the title of the picture is "This ebook-reader belongs to" it might be possible to be found.
Just wanted to thank you for the idea!
Greetings,
Momo