His approach relied on a remarkable adaptability to different styles. Mazo produced repetitions of royal portraits and copies of works by Titian and Rubens. While his portraiture often mirrored Velázquez, his independent work revealed a distinct personality. He was one of the few Spanish artists of the seventeenth century to focus on landscapes. These scenes used a sketchy, quick technique and a Baroque dynamism that avoided the static nature of earlier Flemish models.

Modern collectors value Mazo for his technical precision and his role in the Spanish Golden Age. His portraits of figures like the Count-Duke of Olivares and the Infanta Maria Teresa provide a direct link to the Habsburg court. These prints offer the formal dignity of Spanish court art while demonstrating the fluid brushwork that defined the Madrid school. His work provides an entry into the circle of Velázquez through the eyes of his most trusted collaborator.