Late afternoon, open shade, put the sun to her back, lens flare the hell out of it for a few shots, shoot wide open and spot meter for the shadow side.
Shoot XP2 and 400h at 100 or 200 and mail it off to RPL. it will look amazing.
If you're on 35mm, I'd stick to a 50 or 85mm. If MF, anything 80mm or longer.