Please add to my knowledge. I havent done too many portraits.
no flash or strobes, with reflectors.

Sun as the main light. Positioned 45 degrees from the sublect/camera. Reflector - fill light
find a position where trees or scrims or clouds that will difuse the light.

Alternatively.
Sun as hair light, positioned behind the subject. Reflector as the main light. (will there be some problems projecting the fill light from below the subject? I.e. Vampire lighting? Can i direct the light downward or eyelevel to produce a more traditional result?