In my slides I choose black and white color because it’s easy to see and the color fit with background. The color of letter I choose white color because it’s easy to see and when look at the background it’s not dazzle.
The picture should have pie charts because it easy to understand and clearly the vision
Charts are not clearly because it hasn’t textbox for explain about each color bar inside the charts.
In my opinion I think in the background slide should use dark tone color, it will make you feel better when you need to spent a long time to look at the slide than light tone color. About the text in slide should contrast with the background color.