Aerial Photography
Should a PPL use his aeroplane from which to take photos, why not. The PPL photograher may charge what he likes for his photos but must not charge for the flight or his services as a pilot.
Should a PPL transport a photographer with the intention of taking photos then the situation changes. The photographer is a paying passenger and the appropiate laws come into play. If I remember correctly Skyviews said that they employed a person who was a photographer but used an aeroplane only as a means of conveyance for which the photographer was properly qualified to do. The photos were sold as one off items at a later date but had not been commisioned and no charge was made for the actual flying or pilotage.