Giacomo Antonio Mannini 

This engraving by Ottavio Leoni depicts Giacomo Antonio Mannini. Leoni was an Italian painter and engraver, known for his portraits. The engraving features Mannini in a three-quarter profile, with a detailed depiction of his clothing and facial features. The use of hatching and cross-hatching creates a sense of depth and texture, characteristic of Leoni's style. His work showcases a keen eye for detail and his understanding of human form. The engraving serves as a visual testament to Mannini's life and the artistic talents of Ottavio Leoni.