Tips for Not Fearing Eras
Once you have carefully looked at all three paintings, asked a bunch of questions about them and about yourself, even looked through some Internet links, it's time to get your ideas together.
There's no one way to do this, but here's an idea you might consider:Step One
Make a column (like below) for each of the three paintings and list all the features for each that you think are important. These are things that probably standout and draw attention to themselves in each of the paintings.
Look at the three lists with an eye for things that are similar. The trick here is to see similarities in patterns, themes, attitudes, or any of the elements of design. Try to find three key features, techniques, ideas, etc, that each of the works uses. Make sure you look for specific examples within the paintings to prove your point.
(Would you like to see the rubric people could use to evaluate your writing?)