John Bright, Daniel O'Connell, Richard Cobden, and Charles Pelham Villiers were some of his political commissions.
Daniel Lee, one of Duval's first patrons commissioned him to paint a life size painting of O'Connell, who allowed him one two and a half-hour sitting.
Records show Cobden paid Duval  £10.10.0.
for his full-length portrait in 1853.
All these portraits were worked in oil.
Occasionally he worked in watercolour, for example Thomas Milner Gibson in the National Portrait Gallery.

He executed a series of water colour vignette portraits of the leading members of the Anti-Corn Law League, which were engraved and published, and reproduced on pocket handkerchiefs.
John Bright, Daniel O'Connell, Richard Cobden, and Charles Pelham Villiers were some of his political commissions. Daniel Lee, one of Duval's first patrons commissioned him to paint a life size painting of O'Connell, who allowed him one two and a half-hour sitting. Records show Cobden paid Duval  £10.10.0. for his full-length portrait in 1853. All these portraits were worked in oil. Occasionally he worked in watercolour, for example Thomas Milner Gibson in the National Portrait Gallery.
He executed a series of water colour vignette portraits of the leading members of the Anti-Corn Law League, which were engraved and published, and reproduced on pocket handkerchiefs.
Charles Allen Duval