Modern flat vector portrait illustration

"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 or similar). 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."