Muriel was a talented amateur painter who was a long-time member of the Lamorna Kerr Art Group, at Lamorna, though her home was in Penzance. She exhibited in all the mixed shows that the Group held annually at the Lamorna Village. 

Her specialty was sea paintings. She continued with the Lamorna Group after Mornie KERR's death, and was noticed in the Cornishman last in 1996.