Below is a series of tips for shooting outdoor portraits in daylight without flash:

 -  subject should be as far from background as from camera

 -  use F2.0 or 2,8 for separation from background

 -  expose for skin on face

 -  back lit face with exposed for skin works very well

 -  side light may work in morning light

 -  manage the background

 -  subject should look into camera lens

 -  turn subjects body into camera slightly

 -  subject leaning forward will reduce neck issues