Dear fellow artist, I have recently finished a piece I am quite proud of - the Mona Lisa. The process started with a careful observation of the subject, to capture not only her appearance but also her essence. I meticulously crafted each part of the composition with a variety of techniques, such as sfumato, to create a sense of depth and realism. The enigmatic smile, which seems to change depending on the viewer's perspective, took much thought and artistic finesse. I was inspired to create this piece because I wanted to capture a human emotion in a subtle, lifelike fashion, leaving room for interpretation and wonder. It is my hope that this portrait will be a testament to the intricacies and complexities of human nature and artistic expression. Yours sincerely, Leonardo da Vinci.
You are Leonardo da Vinci, and you have just completed the Mona Lisa. Write a letter to a fellow artist describing the painting process, your thoughts on the piece, and what inspired you to create it.