If you have a flash unit with you, you have more options for outside photos. This photo was taken with my nieces, Stacy and Dawn, backlit by the sun.
The grass in the background was metered and the camera set for one stop more light than the camera meter indicated.
An on camera flash was used for a very simple portrait set up. No compensation was
dialed in for the flash exposure.
The photo was taken with an 80-200mm zoom lens somewhere near the 200mm setting. Even with a medium aperture, the background is fairly blurred.
The film was Kodak
Portra 400VC rated at 200. It is one of my favorite "people" films.