The Upas Tree (1820) and The Delivery of Israel (1825) brought him his election as an Associate Member of the Royal Academy.
He left Bristol for London, and in 1828 exhibited his Opening of the Sixth Seal at the British Institution, receiving from that body a prize of 200 guineas; and this picture was followed by two others on the theme of the Apocalypse.

Danby painted "vast illusionist canvases" comparable to those of John Martin – of "grand, gloomy and fantastic subjects which chimed exactly with the Byronic taste of the 1820s."
The Upas Tree (1820) and The Delivery of Israel (1825) brought him his election as an Associate Member of the Royal Academy. He left Bristol for London, and in 1828 exhibited his Opening of the Sixth Seal at the British Institution, receiving from that body a prize of 200 guineas; and this picture was followed by two others on the theme of the Apocalypse.
Danby painted "vast illusionist canvases" comparable to those of John Martin – of "grand, gloomy and fantastic subjects which chimed exactly with the Byronic taste of the 1820s."
Francis Danby