Tone: Beautiful tone is pleasing to the ear. It sounds smooth and rich. There is no strain or hoarseness. It is resonant in the same way a beautiful violin solo is. Expression and volume are parts of tone. It’s no good if you speak so softly that people must strain to hear you and no good if you’re always shouting
Rhythm: Rhythm encompasses the percussive aspects of speech including diction or enunciation, accents, dialects, rate and pace. Slow down a bit and crisp up your diction by being sure to put on word endings.
Breath: Breathe from the core. It should feel less tense and have more freedom.