What makes someone a great actor? Describe the characteristics or skills that an actor considered “great” would have

This is just my personal bias, but to me, a good actor is someone who cannot only provide a good performance in one movie, but stay consistent no matter what genre they're in or what they have to do for the role.

Explanation

name the above painting and its artist. how has the artist used balance, variety, and movement in this piece to emphasize the man waving the cloth, in the upper right-hand corner? be specific in your response.