If you're scanning an article what stands out most?

If you mean using a scanner to copy an image, then you would be focused mostly on the layout of the page, and the graphics themselves. Sometimes, there is a particular cartoon or a graph or a chart that really stands out, or some other visual that catches your eye.

If you mean skimming an article (reading it quickly, just seeking the main points), then you want to focus on finding the main idea, the central theme that the entire plot revolves around.