Impressionism is from the 19th century, so it's a little too modern for Napoleon. Knigh in armor is usually more of a medieval thing too. And a character from the Bible is also kinda old fashioned as well. Impressionists usually paint landscapes and their paintings are usually subtle and dreamy.
The composition of The Luncheon on the Grass is directly inspired by two 16th-century Italian works of art: The Pastoral Concert and The Judgment of Paris.
