In the autumn of 1841, the couple went to Amsterdam for the birth of their only child, Thomas Nicolay Fearnley (1841–1927), who became a Norwegian shipping magnate.
Fearnley left Copenhagen bound for Stockholm in the autumn of 1823 to complete a painting commissioned by Crown Prince Oscar of Norway and Sweden.
He conducted study tours in Norway (1824-1826), at which time he met Johan Christian Dahl in Sogn.
[7] Fearnley traveled extensively in the 1830s, visiting Munich, Paris, London, Hull and the English Lake district.
He mostly painted in small towns south of Naples: Castellammare, Amalfi, Sorrento, Capri and in Switzerland: Meiringen, Grindelwald.
His large studio compositions have a cool monumental attitude with a taste for the powerful and wildly romantic in the favorite motifs, wilderness and waterfalls, and with a strong emphasis on the image's architectural structure.