[5]: 160 In 1584 Juan de Herrera commissioned Perret to print images of the plants and topographical views of the Monastery of San Lorenzo Del Escorial.
[5]: 160 Herrera was to provide the copper plates already drawn by his hand, and Perret was to engrave them for a fee of 600 ducats.
Despite the prohibition on taking on other work, Perret published the first of his portraits, that of the Empress Maria of Austria, in 1585.
[7]: 377 Between 1591 and 1595, he published some allegorical engravings based on drawings provided by Otto van Veen.
[2]: 124 Perret published at least thirty-four books while in Madrid, with more in Lisbon, where he may have moved during the Iberian Union.