Criteria
Lenses suited for traditional portrait photography are medium telephoto lenses, in the 85mm-135mm range, which provide the desired perspective distortion in head and shoulders shots (compressing facial features), and have fast aperture, of f/2.8 or faster, to allow shallow depth of field, focusing attention on the subject.
One can use other lenses, either with shorter focal length (particularly for full body shots), or longer focal length (particularly in fashion photography, to increase the flattening effect, or in very cropped facial shots). Other lenses can be used for artistic effect; one could use a fisheye lens, for instance, though this is considered neither traditional nor flattering.
Read more about this topic: Canon EF Portrait Lenses
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“There are ... two minimum conditions necessary and sufficient for the existence of a legal system. On the one hand those rules of behavior which are valid according to the system’s ultimate criteria of validity must be generally obeyed, and on the other hand, its rules of recognition specifying the criteria of legal validity and its rules of change and adjudication must be effectively accepted as common public standards of official behavior by its officials.”
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—Hubert H. Humphrey (1911–1978)