Q: how do I change the picture for an established contact in the address book

Huntress,

Contacts (Yosemite): Add or change contact pictures

Add or change a picture

1. Select a card, then double-click the picture well.If the picture well is empty, drag an image to the picture well.
2. Do one of the following to change a picture:
   • Drag an image to the picture well.
   • To use a picture from your iCloud Photo Stream, click Photo Stream.
   • To use a face from Photos, iPhoto, or Aperture, click Faces. The name in Photos, iPhoto, or Aperture must match the name in Contacts.
   • If the contact is linked to multiple accounts and has multiple account pictures, click Linked.
   • To take a picture, click Camera.
3. Click Edit to edit the picture.
   • To zoom in and out, drag the slider.
   • To rotate the picture, hold down the Option key while you drag.
   • To apply special effects, click the Effects button.
4. Click Done.