Through their influence he was commissioned to paint a portrait of King Louis XVIII of France, which was given by the state to the municipality of Alais where it was hung in the council room.

[7] In 1833 he agreed to assist Sigalon in a huge task that had been assigned by Thiers, to go to Rome to make a copy of Michelangelo's fresco of The Last Judgement for a room in the Palais des beaux-arts.

[10] Soon after arriving he made four tableaux for the church of Notre-Dame-de-Grâces in Loos, Nord, and several portraits including one of M. Du Bosquiel, mayor of Bondues.

[13] Some of Souchon's pupils and friends during his Paris years included Narcisse Virgilio Díaz, Honoré Daumier and Philippe Auguste Jeanron.

[16] Carolus-Duran (1837–1917) studied drawing at the Lille academy under the sculptor Augustin-Phidias Cadet de Beaupré, and by the age of fifteen had become an apprentice of Souchon, before moving to Paris in 1853.