Actually, considering the amount of backlighting in your scene, I think the detail in the girl's face looks pretty good. You could improve it by adding some fill light, either from a flash or a reflector. But if that is not practical for you, then you might just try dodging the face a little during printing. Don't overdo it; a backlit face will not look natural if it shines as if it were in full sun!
I would agree. It does not look all that bad. If you bring it up a bit the sky will become very light, which in this case it will make the image stronger.