The judges who chose his portrait as the winner included Saatchi Gallery director Rebecca Wilson and illustrator Axel Scheffler, well known for his work on The Gruffalo.

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Donaldson was quick to reassure audiences that Drawing Julia was neither a narcissistic comment, nor a life drawing class, but a chance to chat about how some of her best-known books were brought to life through the efforts of Axel Scheffler, Nick Sharratt and David Roberts.

BBC: Future of Edinburgh's festivals brought to book