Eye contact

Eye contact is, indeed, a powerful communication tool. If someone avoids eye contact with us, we may find them untrustworthy. On the other hand, if they stare at us unrelentingly, we begin to feel uncomfortable. The eye contact is the important aspect of every presentation. If the person is not able to  make an eye contact either he is not prepared or nervous. while presenting, give yourself two to five  seconds to linger on individuals to avoid fleeting, unconvincing eye contact. Don't just sweep the room and the crowd. After the first few seconds, perhaps when you start your second sentence, shift your glance to another person. Now, throughout the rest of the speech, move from one person to another with your eyes. This would increase the interest of the listeners in the presentation and would feel like getting person attention from the presentor.