The following three strategies might be helpful to focus your thoughts and research progress into the shape of your academic assignment.
Who is involved?
Why did this happen?
Why is it important?
Where Does a more specific location make your topic more interesting? (aka history of the Black Panthers in Baltimore)
When Is there a particular moment or block of time that is most interesting to you?
-Image credit: flickr user francois karm
What do you know about it already? What's missing?
What's the most interesting part of the picture? The people, the objects, the building, etc.?
Is this picture historical or current? What time period?
Do you picture a specific geographic region?
What kind of information do you need to fill out the picture? (e.g., a brief summary or a lengthy explanation, articles or books; statistics or interviews)