When you get towards a higher level of presentation skills, you should also think about and control the audible emotions in your voice. At the beginning you will be working on controlling the effects of feeling nervous on your voice, but once you have managed this you can look start to focus on the next step.
Being able to control your voice for making emotions audible by your audience is very powerful.
Can you make yourself sound happy, said, exited?
Being able to control your voice to make that your audience can hear a certain emotion that belongs to whatever you are talking about will make your presentation more powerful.