It would be nice, to be able to change your avatars expression. You have the pose option, why not facial expression? Like, we can close it's eyes, or open it's mouth and stuff. Not just when you create the char, but whenever you feel.
There should be a place to change eye color too, or, there could be like, a Contact Lense item. Like the hairstyle place, you can pay to but contact lenses, or just plain change the color.
More range of expression would be nice. Like I said before, being able to, close the eyes, or half close them. Make them look to one side. Or, look up. For Mouths, you can go into your "Customize Me" place and just pick a different face.