Technical marketer here. I hate fluff. I can spot it a mile away. If you have a hero image that adds no value then don't use it. If it has a related screenshot

Technical marketer here. I hate fluff. I can spot it a mile away. If you have a hero image that adds no value then don't use it. If it has a related screenshot with interesting or useful information in it (like a code snippet and resulting output that the tutorial covers), that might be useful. Otherwise just... don't.