Making an impression during presentations is as important as the presentation itself since it always advisable to appeal to the subconscious of your listeners as well.
Because believe it or not, there are times, when nervousness gets a grip hold, our body language is quite different from what we mean to communicate through our words. And that could be quite harmful for our reputation as well as our job.
Which is why, it is always advisable to maintain eye contact with the audience thereby capturing their attention. Also , being asked to remain calm might sound like being chastised when you have such an important presentation to give but it is still sensible to remain calm since that exudes your confidence on your work and effort.