They are not your whole speech. You should not be reading off of your visual aid.
You should be looking at your audience and referring to what is on your visual aid from time to time
Depending on the format you use, you can choose crazy fonts, those font are probably not a good idea.
Choosing an appropriate background is also a must.
If it is hard to read the font on your background, you need to change it.

All images must help the audience further understand the topic you are explaining.








Using too many pictures makes it a little crazy...












Having too much white space is also a bad thing...
There should be something else on this page.