Generate an avatar in a minimalist modern vector style, with a fixed head and shoulders composition. The avatar should have a cheerful expression, predominantly smiling, and be dressed in a graduation cap and gown. Introduce subtle variations in cap color, and include simple accessories like glasses. Ensure diversity in gender, ethnicity, skin tone, hairstyle, and hair color while maintaining uniformity in the overall design , isolated white background --style raw --stylize 50 --v 6.0