First, it doesn't describe the Palestinian as a man, which in newspaper parlance he would normally be. Under 18 is a boy, 18+ is a man, regardless of how immature most 19-year-olds are. By leaving out the word "man" it leads people to think of him as a minor since he's still technically in his teens.
Second, it didn't describe the girl as Jewish, leaving it ambiguous for people who aren't especially informed about which people live in a "West Bank settlement." It doesn't automatically lead people to think "this was a terrorist attack on a Jewish child," it leads people to think "this was some kind of crime based on unknown factors."
Third, conversely, by describing her as a girl who lives in a West Bank settlement it's a wink and nod to people who are informed that this attack was justified in some way or that it's the fault of the Jews living there.
The unbiased headline is, "Palestinian man murdered 13-year-old Jewish girl in her bedroom in 20th* terrorist attack in Israel since Ramadan began."
*I made this number up for illustrative purposes.