Here are some general guidelines for taking good portraits:

 Use longer focal lengths instead of shorter (telephoto instead of wide angle). This will make your subject’s face more natural and less bulbous.  
Use a wide aperture for shallow depth of field. This will focus attention on your subject and not your background.
 Avoid distracting backgrounds.  
Try to achieve even illumination by exploiting natural light. If you can’t use natural light, then use studio lights and/or multiple flashes and/or a bounce flash  
Avoid taking pictures where part of your subject’s face is in shadow unless you really know what you’re doing.
Avoid using a single flash pointing directly at the subject. This will create harsh shadows on either the subject of the area behind the subject.

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