When creating an artist portfolio to demonstrate your individual art style, the selection should be guided primarily by the art style you like to draw in most that makes your work unique. This choice will showcase your personal voice and artistic identity, making your portfolio a true reflection of who you are as an artist.
While knowledge of other art styles and the ability to copy famous masters can enhance your skills and understanding of art, the core of your portfolio should focus on your unique vision and creativity. Including a large variety of art styles might dilute your personal brand and confuse viewers about your primary artistic focus. Therefore, it's best to emphasize work that aligns with your unique style and passion.