(top) Peter II of Brazil in the oppening of the General Assembly (Dom Pedro II na abertura da Assembleia Geral). Pedro Américo. Oil on screen. 288 × 205 cm.1872, Museu Imperial, Petrópolis, RJ [Brazil].
(middle) Sketch of imperial scepter and crown (Esboço de cetro e coroa imperais), Jean-Baptiste Debret.
The artist Jean-Baptiste Debret based his designs on the previous United Kingdom of Portugal, Brazil and the Algarves (existing from 1815-1822. The serpe replaces the orb while the crown gets stretched and gains distinguished symbols.
That can be easily seen on the bottom two pictures! The first, in which both sovereigns, from the United Kingdom (John VI of Portugal) and from the Empire of Brazil (Pedro I of Brasil, Pedro IV of Portugal) are put side by side. And the latter, in which the artist didactically places side by side the symbols of royalty from the United Kingdom of Portugal, Brazil and Algarves, and the Empire of Brazil. It should be noted differences in the emperial garment: the red colors gave place to the green, while the mantle becomes a poncho.