An argument paper is one in which the author takes a specific stance on a topic and attempts to sway the reader. Argument papers are not always assigned as such and may include certain types of ...
Do you have an introduction that draws your reader into your argument? Do you have a conclusion which leaves the reader feeling the strength and logic of your position? Revise, revise, and proofread.
More argumentative paintings, by Goya, by Picasso, by David himself in his earlier phase, seem one-eyed and didactic next to it. And what was David? A political practitioner, a social being.