[1] On return from France and Italy he was invited to join the staff of ECA, where he taught drawing and painting from 1956 until 1988.

[1] In 1959 he was commissioned to paint the mural Christ in Glory in the Scottish Episcopal Church, St. Columbas-by-the-Castle in Edinburgh which was influenced by his travels and informed by his personal Christian faith.

His own books ranged from a study of the art of Eric Ennion (The Living Birds of Eric Ennion 1982 Victor Gollancz), two editions of Drawing Birds for the RSPB (1986 and 2004), the limited edition Nature Drawings (1992 Arlequin Press), the more autobiographical Land Marks and Sea Wings (2005 Wildlife Art Gallery), and Lines from Nature (2016, Langford Press published posthumously).

The book which summed up his whole approach to nature and art was the 2013 Looking at Birds – An Antidote to Field Guides where he suggested that aspiring artists (and birdwatchers) could 'twitch' a single species, maybe "collecting shapes of blackbird".

In 2009 Busby was declared Master Wildlife Artist[2] by the Leigh Yawkey Woodson Art Museum in Wisconsin USA.

A much celebrated wildlife artist, Busby was also a dedicated landscape painter whose work was often executed in bold colours, in styles ranging from highly representational to near abstract.