Katherine's work which gives a bird's-eye view of the Royal Wedding route.
The light blue line indicated the procession's progress from St James's, turning left and travelling down the Mall, then finding its way across Horseguards' Parade and into Whitehall.
After the service, the happy couple emerged as man and wife and - shown by the purple line - retraced the route back into Whitehall, across Horseguards' Parade and into the Mall. But this time, instead of turning into St James's, the carriage continued straight ahead and through the main gates of Buckingham Palace and across its central courtyard.
Katherine's artwork shows a fly-over by a World War II Wellington bomber and Spitfires. She also illustrates the locations of the huge television and media studios, both at Westminster and the Palace, broadcasting the event around the world. She has drawn a compass as a wedding cake.
Drawing such pictures is all in a day's work for Katherine. Other examples of her artistry - showing the parks around Brentford - can be seen by clicking on the menu just above the artwork.
Katherine has also been commissioned by the Post Office to design stamps for the 2012 Olympics.
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