Everyone now knows how to get their hands on beautiful images. The next challenge to make your presentation stand out is to pick the right ones. I prefer to do the chart concept brainstorming myself, rather than relying on a stock image search engine to do it for me. We completed the project. Typing in "success" for "finish" will give you a stream of highly predictable and often cheesy images. "Man in suit raising his arms in victorious joy", "hiqh quality render of a character crossing the finish line". You/the human brain can do better than that. Think of the concept you want to make, all the way to the end. Then, search a highly specific (stock) image that goes with it. Armstrong waiving his hand on the moon, a bunch of empty, used coffee cups on a desk.
And remember, the right visual concept does not always involve an image.