iwm2020. The Watercolor Masters return to the UK. England will host the worlds elite watercolour Masters exhibition of 2020. #iwm2020 This master alliance of great artists will show their masterpieces at Lilleshall Hall England. Watercolour paintings from top watercolour artists are on show. Featuring watercolour artist and world masters David Poxon RI, Alvaro Castagnet, Julia Barminova, and many more great painters. Demonstrations and lectures, workshops, art market from the SAA. Italian Gardens and woodland walks all at iwm, international masters of watercolour, these world watercolour masters only at Lilleshall Hall England.