How to recover User ID snapshot file?
Execute this command in Terminal and see what happens:

dscl . -read /Users/[user_shortname] JPEGPhoto | tail -1 | xxd -r -p &gt; ~/Desktop/any_file_name.jpg


Ex:

dscl . -read /Users/U92 JPEGPhoto | tail -1 | xxd -r -p > ~/Desktop/U92.jpg

Gleaned and distilled from this AskDifferent page.