Final answer:
Bronzino's portraits are noted for their formal effect, achieved through the use of costume and setting, which convey the haughty demeanor of the subject.
Step-by-step explanation:
The portrait in question showcases Bronzino's ability to use formal effect with his choice of costume and setting, yet conveys the haughty demeanor of the subject. This choice highlights Bronzino's skill in Mannerist portraiture, where artists often depicted their subjects with a certain air of aloofness and self-importance. The costume plays a significant role in the formal effect because it serves not only as an indication of the subject's social status but also helps to set the tone for the subject's personality. The setting, often consisting of a detailed or dramatic background, further underscores the grandeur and formality of the portrait.