How did Henri Rousseau learn to paint without formal art training?

Henri Rousseau did not receive formal art training; rather, he was a self-taught artist who developed his craft while working as a petty official and tax collector in Paris. Although he had likely drawn and painted since childhood, he remained essentially an amateur for much of his life, balancing his artistic pursuits with his professional duties and family responsibilities.1

His development as a painter was largely driven by his own dedication and observation:

• Independent Study: In 1884, he obtained permission to copy paintings at the Louvre, which allowed him to study the works of established masters firsthand.1
• Observation of Nature: For his detailed jungle scenes, Rousseau studied plants at the botanical garden in Paris, meticulously rendering individual leaves and forms.1
• Artistic Ambition: Despite his lack of conventional technical skill, Rousseau possessed an intense desire to express himself and held a strong, albeit naive, ambition to paint in the style of the academic painters of his day.1

He eventually gained recognition through the support of avant-garde intellectuals and artists who admired the unique, poetic quality of his work.1