現代風格的向量肖像，戴著圓形黑框眼鏡，留著濃密鬍鬚，髮型蓬鬆，背景為綠色

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Create a clean, modern flat vector portrait illustration of the same person in the reference image. Preserve the exact facial features, face shape, expression, black round eyeglasses, and overall hairstyle. Use natural jet-black hair with realistic highlights and texture, styled exactly like the reference—thick, voluminous, slightly messy, and swept upward. Make the beard full, neatly trimmed, and natural black. Dress the person in a plain black crew-neck T-shirt. Replace the background with a solid vibrant green (#2E7D32). Use smooth gradients, crisp edges, minimal shadows, and a professional Adobe Illustrator/Dribbble-style vector aesthetic. Center the portrait, front-facing, symmetrical composition, shoulders visible, high detail, clean lines, high resolution (4K), with no text, logos, watermarks, or extra objects.