Answer: One difference between the two paintings is the <em>Brushstrokes. </em>
Explanation:
In David's painting "Oath of the Horatii" he used <u><em>smooth brushstrokes</em></u>. By using smooth brushstrokes, this enhanced the quality of the figures and made them to look lifelike.  This particular painting has a planned background that looks like a stage set. 
In Delacroix's painting "Liberty Leading the People" he used an <u><em>expressive brushstroke</em></u>. His expressive brushstrokes added drama to his paintings. He used bright colors in his paintings and added pigment throughout each one. 
 
        
             
        
        
        
Probably express themselves and others
        
             
        
        
        
You can take pictures of people where it doesn’t look staged and they look genuine