@memoekbal: Please head to the Contacts app > Select a contact > Tap on the camera symbol at the top of the screen to add a caller photo > Select 'Gallery' > Choose a photo. From here you can adjust the framing of the picture by dragging the corners of the frame, and zoom in and out by placing your thumb and forefinger on the photo, and spreading/pinching your fingers accordingly. This way you can zoom right in on a contacts face, and crop the image to enlarge it in this fashion. I hope this helps.
