The photos shown on ADS-B Exchange are not provided by ADS-B Exchange, rather they are hosted and provided by planespotters.net. PlaneSpotters.net is showing the latest available photo in the database for the selected hex and registration, which may not always be perfect.
You can help ensure that the database is up to date with photos by submitting photos/corrections to planespotters.net. You can submit requests to them directly and they should be able to update the aircraft picture.
There is a free upload functionality on the website: