In this article we want to reflect the study that we have done about the pictorial technique of the Church of Santos Juanes of Valencia lunettes’. These lunettes were made nu the Guillo brothers in 1695 and, to date, there are few studies that delve into the projection, implementation and technical development process. The existing bibliography just mentions the influence of Andrea Pozzo in this intervention, but does not specify what kind of influence in terms of technique. The influences from Guillo are captured through a thorough research of the maps, technical studies and especially pictorial technique studies compared with the treatises of the period development.