Well done for today's tutorial work. All of you have prepared well and able to present quite smoothly. However, there is still more room for improvement in terms of delivery and your presentation skills.
Here are some important points to bear in mind to improve on your presentation and delivery.
1. PowerPoint Slides
Do not overload each slide with large chunks of texts. This practice will hamper your delivery as you tend to be overdependent on reading from slides rather than presenting your points to your audience. Additionally, 'overloading' can affect the clarity of ideas. Consequently, you lose your audience.
However, I think Ya Vern's group as well as Mohamad's group did quite a good job as they have utilized some Smart Art graphic as well as imported Infographics into their slides.
2. Positioning
When presenting, please make sure that you maintain constant eye contact with your audience. Thus, it is important to position yourself comfortably so that you are facing your audience and not showing your back to them. If you need to refer to the slides, then you should be looking at the laptop screen rather the projected slide from the PROJECTOR. As you have observed just now, some of friends seemed to be talking to the screen instead of the audience.
PRACTICE, and PRACTICE, and LEARN FROM MISTAKES!!!