Yes, they need more faces. And while bigger / smaller noses and so on would be greatly welcomed, the facial rigging could be the biggest factor here, in my opinion. Pandaren can do soooo many great looking facial emotes. They are at least up to par to the WoD models in that regard.
10/10, would immediately and with great pleasure take as idle face. She looks cool, calm and collected, and a little bit careful. So much better than the :3 smile, for a "serious" character.
Make a slightly angry, feisty version, and a sad, melancholic version, and so on. Then allow us to choose eye color independently from the facial markings, cause that's bugged me for a long while -- can't get my favorite markings with an eye color that I like. And voilá, Pandaren now have pretty good facial customization.