A nightmarish depiction of an evil Oni, inspired by traditional Japanese culture, in portrait view, showcasing a highly detailed, hyperrealistic design with 8k resolution. It's concept art with a mid-shot focus, featuring intricately detailed features and deep color, set in a dramatic composition. The figure is captured at a 2/3 face angle with side lighting casting dramatic shadows. The colorful background accentuates the Oni's fearsome appearance, avoiding features like tiling, poorly rendered elements, extra limbs, or unrealistic anatomical distortions. The image maintains a clear and sharp focus, presenting a captivating and intense portrayal without low quality effects like blurriness, grain, or watermarks.