Again, this can't really be seen with the naked eye. However, magnify the fake stamps and you can see that the detail is missing in the counterfeit example. The Queen's earring has less definition, as do the lines in the hair. INSIST ON USING REAL STAMPS.
PLEASE Copy and paste this message to all your listings. In order to improve the fundraising with Charities that collect stamps, always ask for REAL stamps when posting anything, instead of the computer generated label.