I use images very differently now in presentations then 10 years ago:
Zero stock images that look like stock images (fake models, staged compositions, cliche compositions)
I no longer feel the urge to find an image for every slide I produce to avoid forced visual analogies, and get left with a set of images in a presentation that are completely unrelated and inconsistent
Most of the time, my images reflect something real: the actual leadership team, the product, a factory, a city, a screen shot, the cover of a scientific publication, etc.
I am still using commercial stock images if I need isolated objects (a bucket, a hammer, etc.)
Sometimes I might go for a visual theme and try to find images that fit with the concept on virtually every slide (flowers, 50s, record covers, etc.)
Most of the images I use come from the free site Unsplash. As a result, I don’t even bother saving images to disk anymore, if I need another one, I will search for it again.
I often make all the images in a presentation black and white, to make the look and feel of slides more consistent, and let the accent colour of the slides (often just one) pop out more.