A man with a pointed beard and moustache sits turned slightly to his right, his head tilted and his gaze directed outward. His right hand rests on his hip, while his left hand extends forward in an open gesture, the fingers spread and palm facing up. He wears a broad, white, pleated ruff that catches the light, its sharp edges rendered with swift, textured brushstrokes.

The sleeves of his dark garment are adorned with slashes and decorative white elements, painted with energetic, visible strokes that suggest the shimmer of fabric. A row of metallic buttons or studs runs diagonally across his chest, catching highlights against the muted tones of his clothing. The background is a warm, brownish field, softly modulated and free of detail, which throws the figure into relief and focuses attention on his expressive face and hands.

The light falls from the left, illuminating the sitter’s face, collar, and left hand, while the rest of the figure recedes into shadow. The paint surface is lively and textured, with visible brushwork especially in the ruff and hands, giving the portrait a sense of immediacy and movement. The sitter’s hair is short and dark, with a slightly tousled appearance and visible brushstrokes suggesting texture at the crown and sides.

His eyebrows are thick and dark, arching gently over his half-lidded eyes, which are softly shadowed beneath the brow. There is a subtle flush of pink on the sitter’s cheeks and nose, contrasting with the cooler tones of his forehead and jaw. The left edge of the canvas reveals the sitter’s bent elbow, with the sleeve’s slashed decoration catching a glint of light.

A sharp highlight runs along the sitter’s left wrist, accentuating the crisp fold of his white cuff emerging from the dark sleeve. The background transitions from a lighter, ochre-brown near the sitter’s head to a deeper, cooler brown at the lower and right edges, creating a gentle gradient. The lower right corner of the painting shows the sitter’s outstretched hand dissolving into loose, rapid brushwork, with the fingers rendered in broad, gestural strokes.

Fine vertical lines from the brush are visible in the background, especially at the upper right, adding texture and a sense of movement to the otherwise plain field. This is Portrait of Isaac Massa, painted by Frans Hals around 1635 or 1636 in Haarlem.