In Black Diamond, Anastasopoulou employs traditional oil painting techniques to celebrate the horse’s presence through a high-contrast lens. By utilizing a monochrome aesthetic, the artist strips away distractions, allowing the viewer to focus on the raw physicality of the subject. The dark background acts as a void, pushing the luminous highlights of the horse’s coat into sharp relief and emphasizing the animal's noble stature.

The work explores the beauty of the animal through simplicity in form and a focused portrait orientation. Rather than depicting a wide scene, the artist concentrates on the textures of the fur and the underlying anatomy. This creates a sense of visual depth where the softness of the light meets the solid, powerful structure of the equine body, resulting in a composition that feels both grounded and ethereal.