Have any of you ever done a thesis defence before?

I am a theology MA student. I want to make a power point presentation. Ideally I want to pull some images off the internet without permission. Obviously my actual thesis has to have references etc. but if I make a power point for my thesis defence do I need to cite things in there as well like things already cited in my actual thesis?

It’s March break now and so I don’t think I can actually communicate with my supervisor or school.