The Habsburgs ruled Spain as well as Austria making this international marriage a marriage of first cousins. She was deeply religious, returning to Spain after Maximilian died to become a nun, but Maximilian was not. Her daughter Anna married King Felipe II of Spain. This Infanta Maria's Wikipedia article is here.
From Wikimedia; size fixed at 45 cm high at 70 pixels/cm.
Maria wears a plain black coat adorned solely with aglets over a gold and white dress with a very relaxed vee waistline. A satin train (?) emerges from her coat. She wears a large wedge-shaped ornament on her head with the point ending behind her ear.
Keywords: 1563, Arcimboldi, Maria of Austria (1528-1603), Maria de Austria (1528-1603), María de Austria y Portugal, Infanta de España, Archiduquesa de Austria, Emperatriz del Sacro Imperio, Reina de Hungría y de Bohemia, Maria von Spanien, Kaiserin des Heiligen Römischen Reiches, Emperatriz del Sacro Imperio Romano Germánico, Holy Roman Empress Maria, Habsburg family, Archduchess, Empress, Austrian, straight coiffure, hair jewelry, partlet, earrings, high enclosing neckline, neck ruff, carcanet necklace, fitted bodice, jeweled square neckline, jeweled pendant, girdle, vee waistline, surcote, long close upper puffed sleeves, aglets, bracelets, rings, girdle, full skirt, train, handkerchief