Ambrogio Spinola stands in three-quarter view, clad in elaborate black and gold armour, his right hand resting on the hilt of a sword. A crisp white ruff frames his face, which is turned slightly toward the viewer, his lips set in a subtle, confident smile beneath a neatly trimmed moustache and beard. The sitter’s left arm is bent, drawing attention to a vibrant red sash tied in a large bow at his elbow, its colour echoed by the plume of feathers sprouting from the helmet placed on the table beside him.

The helmet, richly decorated and open-faced, sits to his left atop a green-draped surface, its metallic sheen rendered with lively, textured brushwork that catches the light. Behind Spinola, a heavy green curtain falls in deep folds, its shadows providing a dark backdrop that sets off the gleam of his armour and the pale tones of his ruff and hands. Rubens uses a warm palette, with golds and reds dominating the composition, while the skin tones are painted with delicate modulations that suggest both the sitter’s age and vitality.

The artist’s brushwork is visible in the highlights on the metal and the soft texture of the feathers, contrasting with the precise lines of the etched armour and the crisp lace at the wrists. The composition is tightly focused on Spinola’s upper body, filling the frame with his commanding presence and the intricate details of his dress and accoutrements. The lower right corner of the painting reveals the hilt and guard of Spinola’s sword, rendered with intricate gold detailing.

Soft, diffuse light falls from the upper left, illuminating Spinola’s face and the upper part of his torso, while casting subtle shadows on the right side of his figure. At the bottom edge, the skirt of the armour is painted with loose, energetic brushstrokes, contrasting with the precise lines of the metal plates above.