More tips on singing..

• Listen to criticism. Weird, I know. If the criticism your getting is constructive, then pay attention to your audience. If you want to better yourself, take their advice into consideration. Remember, though, if they are trying to bring you down deliberately instead of helping to bring you up, then they are not worth the time and energy.
• Drink lots of water; at LEAST 8 cups a day. water thins and breaks down mucus. Less mucus=better voice.
• Practice singing in front of a mirror, and watch your jaw for unnecessary movement. If your jaw moves when singing vowels or even singing in general, then you should try and prevent that to produce better sound.