Munro was a gifted sculptor associated with the Pre-Raphaelites. Originally from Inverness, his talent was evident in the early clay models he made, which brought him to the attention of Harriet, Duchess of Sutherland. She introduced him to the architect Charles Barry who had designed the new Houses of Parliament. He invited Munro to London to work on the sculptural decoration of the Parliament building. Munro accepted and also enrolled at the Royal Academy Schools, where he met Rossetti, Millais and Arthur Hughes. Munro shared a house and a studio with Hughes for six years.