In the bad example, Jean is too vague, and has a few red flags, like suggesting that her last job didn't end well, and making an inappropriate joke about Scorpios to gloss it over. You can tell people you're great, but it's better to prove it by offering specifics, like she does in the better example. In the second example, Jean's letter body is more clearly organized, and makes sure to give the most relevant details about her career so far.
By now, you probably think you're familiar with all the pieces of an application package and process. You have your resume (or CV), your cover letter, your list of interview questions. And if you have those together, updated and ready to go, awesome! But there's another potential piece lurking out there: a letter of intent. Wait, what? Is that the same as a cover letter? And if not, how do you write one?