When the Royal Photographic Society was founded in 1853, Llewelyn was one of those who attended the foundation meeting at the Society of Arts in London, and was, for some years, a founder Council member. It was suggested at one time that he become country vice-president, but nothing seems to have come of that idea. He exhibited regularly in the early exhibitions of the Society as well as in Dundee, the Manchester Art Treasures exhibition and Paris exhibition in 1855. At this latter exhibition he was amongst those awarded a silver medal for his 'Motion' series.