Coat of arms of Isabella of Portugal, Holy Roman Empress and Queen Consort of Spain
Variant with a lesser version of the Emperor's arms [1]
External ornaments and Shield shape according to: Avilés, José de Avilés, Marqués de (1780). Ciencia heroyca, reducida a las leyes heráldicas del blasón, Madrid: J. Ibarra, (Madrid: Bitácora, 1992). T. 2, p. 98-100. ISBN 84-465-0006-X. 

Own work
Heralder