@david_cass_ (studio shots) & @davidcass_lens (research images). These accounts show images of works-in-progress, exhibition activities and research / research trips.
Instagram is an effective platform for David to directly present to you his paintings, alongside stages of development. It's not as easy to simultaneously present each facet of a body of artwork within the structure of a website. It's also important for the artist that you see where everything comes from. David posts regularly and so these accounts are always up to date.