Reasons Why.?

1)prospective; shape and forms of the line and the way we see it.as wells as form and composition on how the artist organizes and the dimensions,shape, and structure.

2)the boat that appears closer is the one that is closer to the person & the one that appears further is the one that's is far away from the person.bigger closer , smaller further (prospective)

3)the French artist used a lot of the Romans in his painting, he might have liked the Romans. As well he fulfill specific purpose of ones believes.As well as time and place of the painting