1. Tone Quality: The singer's tone should be clear, resonant, and well-projected. The voice should have a pleasing timbre and be free from any noticeable strain or vocal defects.
2. Intonation: The singer should demonstrate accurate pitch and intonation throughout the performance. The voice should stay in tune with the accompaniment, and there should be no noticeable pitch deviations.
3. Rhythm and Timing: The singer should have a good sense of rhythm and timing. They should be able to stay in sync with the accompaniment and maintain a steady tempo.
4. Expression and Interpretation: The singer should interpret the song with emotion and expression. They should convey the message and mood of the song through their vocal performance.
5. Stage Presence and Performance: The singer should have a confident and engaging stage presence. They should connect with the audience and make the performance visually appealing.
6. Song Choice: The singer should select a song that suits their vocal range and abilities. The song should also be appropriate for the competition and the audience.
7. Overall Performance: The judges evaluate the overall performance of the singer, taking into account all the above criteria. They consider the singer's vocal technique, musicality, artistry, and ability to connect with the audience.
8. Audience Impact: The judges may also consider the audience's reaction to the performance and the level of applause and appreciation they receive.