To qualify as newsworthy, a story or photo should exhibit all or most of the following attributes:
The word news means exactly that - things which are new. Topics which are current are good news. Consumers are used to receiving the latest updates, and there is so much news about that old news is quickly discarded.
A story with only average interest needs to be told quickly if it is to be told at all. If it happened today, it's news. If the same thing happened last week, it's no longer interesting.
The number of people affected by the story is important. A plane crash in which hundreds of people died is more significant than a crash killing a dozen.
Stories which happen near to us have more significance. The closer the story to home, the more newsworthy it is. For someone living in France, a major plane crash in the USA has a similar news value to a small plane crash near Paris.
Note that proximity doesn't have to mean geographical distance. Stories from countries with which we have a particular bond or similarity have the same effect. For example, Australians would be expected to relate more to a story from a distant Western nation than a story from a much closer Asian country.
Famous people get more coverage just because they are famous. If you break your arm it won't make the news, but if the Queen of England breaks her arm it's big news.
Human interest stories are a bit of a special case. They often disregard the main rules of newsworthiness; for example, they don't date as quickly, they need not affect a large number of people, and it may not matter where in the world the story takes place.