A headline works like a first impression, so it needs to catch someone's eye right away. One simple way to do this is to make the reader curious by mentioning a small part of the main idea without giving everything away. For example, instead of saying "Tips for Better Photos", you could say "A Simple Change That Makes Your Photos Look Sharper". Another approach is to focus on the benefit the reader gets, because people respond when they see how something helps them. It also helps when the headline feels natural and not forced. Testing a few options can show what people respond to the most. What do you think?