Special note to the south Indian classical dancers:
A real danceuse (patra), according to Abhinayadarpanam (one of the two most autoritative texts on Bharatanatyam), must possess the following qualities. She has to be (1) young, (2) slender, (3) beautiful, (4) with large eyes, (5) with round breasts, (6) self-confident, (7) witty, (8) pleasing, (9) well-aware of when to dance and when to stop (able to follow the flow of songs and music, and to dance in tact (thalam)) (10) with splendid costumes and (11) of a happy disposition.
The danseuse must be beautiful, for according to Sangitaratnakara the true dance relates to a beautiful body, and any dance other than this is caricature (VII.1246).
You can easily find out if a particular dancer is authentic or not by reading about the criteria of a real dancer (patra) in the Natya shastra (XXVII.97-98).
The ten disqualifying criteria according to Abhinayadarpanam: (1) women with white specks in the apple of their eye, or (2) women who have scanty hair, or (3) have thick lips, or (4) pendant breasts, or (5) who are either very fat or (6) very thin, or are either (7) very tall or (8) very short, or (9) hunch-backed, or (10)voiceless.