If it is a cloned car, normally the owner of the original can can pinpoint minor differences in in the vehicle, whether it's the bumper shape, trim or whatever else. You could contact them and ask them to email you the orignal full-size image so that you can check more thoroughly.
On the other hand I can't see anything obviously wrong with the PCN, and £22 must be the cheapest PCN in the country. In London the minimum charge for some PCNs is £90 with the discount, and they go up to £180 after 14 days.