The Katie series by James Mayhew is a wonderful introduction to the art world for children. My grandson aged 8, came home from school one day and asked to go to the National Gallery! When I asked him why, he explained he wanted to see Whistlejacket by Stubbs and some other paintings by Turner, Constable and Gainsborough, that he had read about. This enthusiasm was thrilling to see, only equaled by our day out in London to the National Gallery to find the paintings he had read about. I have since bought the whole series for him and Katie and Mona Lisa was another brilliant read.
A brilliant book for young children as an introduction to art. We had the pleasure of seeing this as a lively play and meeting the very charming author afterwards and as the book had sold out on that day we've rushed to but it afterwards so it doesn't fade from our children's minds.. There are many other lovely books in the series, all equally delightful and many depicting paintings from the National Gallery in London which is great if you happen to live reasonably nearby!