Begin by looking at Bernini's David created in the Baroque style: (http://www.galleriaborghese.it/borghese/en/edavid.htm)
Then look at Michelangelo's David created in the Renaissance style: (http://www.bc.edu/bc_org/avp/cas/fnart/art/ren_italy/sculpture/7_93_4_44.jpg)
Question: How do differences in these statues represent differences in the Baroque and Renaissance styles?
Refer specifically to body motions, facial expressions, and anything else that you believe reflects differences in these periods of art based on your own research and background readings.
First, look at obvious differences: size, clothing/lack thereof , location/patron, and how these things contribute to the overall impression of the sculptures. You can discuss life versus over lifesize, nudity as a costume, the accessories of the sling and the armor, the people who commissioned the works, etc.
Second, look at the pose and expression of each statue. Both Davids are focused on an unseen Goliath, but one statue is inviting you into the action while the other doesn't even notice your presence. Pay attention to what the pose is saying. One is more a study of the beauty of the human form, attributes of David only noticeable on second glance. The other is swinging into action, accessories ...
The differences in the statues represent differences in the Baroque and Renaissance styles are determined.