What makes a good Screenshot?

I know what i like in a Screenshot. I like when someone puts it all together. I like the WB, the Dock, The WP, The Icons and Widgets (or whatever these objects, gadgets blahh blahh are now called) to relate to the Blind and various components in a creative way. What was the original artist of the WB thinking? Sometimes the screenshot will show something about the Blind that the creator of the Blind didn't see or think about. Sometimes a Screenshot is boring and just fills the Screen with calendars and widgets and icons for the sake of filling the Screen. I think it's first about the WB and then how all the other things fit in. What makes a good Screen Shot?