Final answer:
The Dutch master who painted 64 self-portraits was Vincent van Gogh.
Step-by-step explanation:
Van Gogh, a post-impressionist painter, is renowned for his prolific output and emotional intensity in his works. His self-portraits, spanning his career from the early 1880s until shortly before his death in 1890, provide a unique insight into his artistic evolution and inner struggles.
These self-portraits often depicted van Gogh experimenting with different techniques, color palettes, and expressions, reflecting the challenges and emotional turbulence he experienced throughout his life. The series of self-portraits serves as both a documentation of his artistic journey and a poignant exploration of self-expression, capturing the complexity of his mental and emotional state during different phases of his artistic career.