Da Vinci- Painted the Mona Lisa, one of the most famous pieces of artwork of all time. You could also research the various inventions he designed and his work as a scientist (like his experiments in anatomy).
Michelangelo- Most well-known for painting the ceiling of the Sistine Chapel, and his various sculptures.
A great actor is realistic and can portray emotions really well. They are able to bring the character they are playing to life through superb body language and tone.