The Royal Guide is out with the May issue of Tatler and shows Petra's regal watercolour illustrations on a double page spread about the jewellery brand. Petra says "This was my first time I've worked for Tatler Magazine. It was a great experience to work for the brand Mappin & Webb, to draw the Crown jewels, which are kept in the Tower of London. A really great challenge to draw all the fineness of jewels with the brilliant colours."