Early period (1530s) It seems that Bonasone started his career during the 1530s, when the earliest of his engravings can be dated. Among them is the
St Cecilia (1531), which is a rough attempt in reproducing Raphael's work. The pervasive use of straight hatching lines, an indication of his awkward technique, is the evidence for it being an early work. Another work of Bonasone,
Adam and Eve Toiling, also demonstrates a clumsiness. The
Triumph of Bacchus was executed at a slightly later time. This etching presents more advanced skills and clearer lines, but the presence of straight hatching lines is still a major problem in Bonasone's technique. This absence of contouring lines leads to a lack of depth in figures and makes the figures less real. In the
Triumph of Bacchus, contrasting tones resemble the use of light and shade in painting. This later became an identifying feature of Bonasone's prints. In fact, Bonasone's technique was consistent during the 1540s; what changed was not technique, but the way in which Bonasone dealt with light and form. His engravings, viewed from a distance, are like black-and-white paintings. By executing his engravings in such a painterly manner, Bonasone excelled as a reproductive engraver. His engravings resembled the masterpieces to a superb degree without the common problem of triteness. Bonasone made small engravings to 150 of the verses in this book. Although the engravings vary in quality, it is likely that composing and executing these engravings required a few years' work in the 1550s. Moreover, there was no work dated to the 1550s that had Roman styles. This further reinforces the theory that Bonasone spent at least part of the decade working in Bologna to produce the illustrations for Bocchi and a couple of other works at the same time. The small size of these engravings constrains the amount of detail and the room for innovation. The lines and hatchings are usually systemized and cursory. It appears that Bonasone believed the nature of his project to be illustrative and prioritized the clarity of iconography over the style. In turn, this technique was also observed in later works by
Agostino Carracci, implying the influences from Cort to Bonasone to Carracci. In Bonasone's original design, the
Incarnarion, one would find the composition properly conceived but the technique distinct from that of the
Judgement of Paris. The tiny flicks and subtle lines are replaced by broad contours of non-constant thickness. Although Bonasone did not adopt the method of varying a single line's depth to create the effect for shadows, he connected the deeper lines to the shallower ones to attain the same goal. Several other prints such as
The Holy Family with Saints Elizabeth and John, and the
Holy family with St John, could also be included in this category. However, Bonasone did not apply this technique uniformly across all his engravings. He made variation to his technique to achieve different effects, sometimes imitating the style of Giulio Romano and sometimes approximating the style of Parmigiano. It is difficult to determine whether Bonasone returned to Rome after working for Bocchi since his work after this period of time was based more on designs or panel paintings instead of Roman frescos. However, he probably returned to Rome to work on prints such Raphael's as
Qua Vadis, the
Virgin and Child with a Bird, and Michelangelo's
Nude Carrying the Cross. == Artistic achievements ==