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Just go with the flow during your speech which means if you need to use hand gesture to express yourself then do it. Audience might feel awkward if you stand in front of them and giving speech in a monotonous tone of voice. they might think that you are reading your speech rather than emphasizing it word for word. using hand gesture you will feel more relaxed and at the same time your tone of voice will change and it will sound more confident than you can never imagine.
Just be yourself. Any alteration in behaviour pattern will lead to anticipation of faking the interview.
Just have control on the content what you speak. Answer only what is needed. Too much of over information might lead the discussion to some other angel.