There, as most sources state, he stayed until 1818 and in 1813 he was granted membership of Saint Petersburg Imperial Academy of Arts.
During his stay in Saint Petersburg, very appreciated by the court of Alexander I of Russia, the artist taught at the Imperial Academy of Arts and painted a great number of portraits of royalties and aristocrats.
[7] His miniature are fresh and well drawn, very fine painted in small, crossed, narrow strokes, the general direction of which is from the upper right to the lower left.
This technique allows him to give extreme sweetness to the sitters portrayed always represented in a psychological dimension of great depth and introspection.
Some painters named Dubois worked at the end of the 18th century and the exact attribution of miniatures signed with this surname alone can sometimes be uncertain.