He discovered an aptitude for literary and artistic pursuits from an early age, and was soon associated with writing for periodical publications, including Colburn's New Monthly, Bentley, and Punch magazine.
He could also draw and worked on wood, etchings and caricatures using pen and ink, specialising in anthropomorphic animals, occasionally illustrating stories for his brother Charles Robert Forrester (1803–1850), who wrote under the pseudonym Hal Willis.
He also made several popular ceramics of curious flowers and contemporary subjects, including a "Memorial of the Great Exhibition of 1851" and a statuette of Wellington Bear.
In 1854 Julia Corner wrote a play for children based around the Beauty and the Beast fairy story which was illustrated by Forrester working under the name of Alfred Crowquill.
[4] His Strange Surprising Adventures of the Venerable Gooroo Simple..., consisting of comic tales set in India, appeared in 1861, again under the pseudonym Alfred Crowquill.