Vincent van Gogh's creative processes were deeply intertwined with his emotional state. Often battling mental illness, he channeled his struggles into his art, utilizing vibrant colors and dynamic brushwork to express his feelings. For instance, during periods of despair, his works like "Starry Night" reflected turbulence, while others, like "Sunflowers," showcased moments of optimism. Van Gogh's letters to his brother Theo reveal his self-reflection and quest for meaning, highlighting how his internal conflicts informed his artistic choices. His commitment to portraying emotional depth in his art ultimately contributed to his lasting impact on Post-Impressionism.