He doesn't really look angry to me. And he does have a beard and is Arab so those seem like things that will be in every picture of him.
I'm sure hos photo is from the wanted list and hers is from her bio somewhere, but the juxtaposition just serves to magnify the point.
I think they were attempting to imply he was more dangerous than her and more deserving of being on the list. Its probably true, but tactically chosen pictures make the differences between them more extreme, less than a mug shot of her and a wedding photo of him would, as an example.
I am surprised they didn't find the classic terrorist photo (holding a weapon) they usually seek out for these headlines.
Compared to what I usually see, this is pretty mild.