Its subject is in a relaxed and elegant pose, wearing a black costume with grey braids and a thick gold shoulder chain with the Order of the Golden Fleece and holding a hat in his left hand and a glove in his right. The figure appears in the darkest point of the space and the artist added a 4 cm strip on each side to add to its sense of authoritarianism.
Velázquez , exhibition catalog from The Metropolitan Museum of Art (fully available online as PDF), which contains material on this portrait (see index)