Essex accordingly painted numerous miniature reproductions of pictures by Correggio, Guido, Wilkie, Abraham Cooper, Sir Joshua Reynolds, and others, displaying the wide capacity of the art.
He also contributed to the exhibitions at the British Institution, Suffolk Street Gallery, and the Liverpool Society of Fine Arts.
[3] He was appointed enamel-painter to Princess Augusta of Cambridge, in 1839 to Queen Victoria, and subsequently to Prince Albert.
A son, William B. Essex (1822–1852), followed his father's profession as an artist: though prevented by his early death from obtaining any reputation, he exhibited at the Royal Academy from 1845 to 1851.
Another daughter, Hannah Essex (baptized 29 May 1832, married name Bird) also practised as a miniature painter who worked in enamels based at her fargwe's address.