How did Portrait of Monsieur Bertin represent the newly powerful middle class in France?

In his 1832 Portrait of Monsieur Bertin, Jean-Auguste-Dominique Ingres captured the essence of the newly empowered middle class in France following the Revolution of 1830.1

The painting serves as a "pictorial paean" to the tenacity of this social group. Ingres achieved this representation through a masterful characterization of his sitter, Louis-François Bertin, who is depicted with a pugnacious and commanding presence. The work is noted for its mesmerizing realism, which helped Ingres secure both popular and critical acclaim at the 1833 Salon. By focusing on the strength and individual character of a prominent member of the bourgeoisie, Ingres effectively embodied the rising influence and self-assurance of the middle class during the Orléanist regime.1