Many business presentations contain pages with images of projects: real estate, solar farms, factory installations. Usually, they are small, low resolution, many on a page, and backed up by a dense paragraph of explanation.
To make your presentation look better: do the opposite. Stretch them across the full page, use high res images, use 1 image per page, and set a brief explanation text over the image.
The audience will not notice that you clicked through 7 slides when discussing your project portfolio. For them, it is just one slide.
Another way to show off your portfolio is to use the images throughout the presentation on separator and title pages that mark the beginning of a new section in your story. So, you have 1 image on your portfolio slide with the explanation that is 1 of 35 buildings. The audience gets a sense of the other 34 throughout the presentation without talking directly about them.