Google determines which photo represents the services or products the business offers.
We’ve discussed the importance of strategically using keywords to describe your services and products. The same applies to your use of images. Try using original photographs from your business (e.g., clinic exterior and interior, professional staff, etc.). By adding your images from your business, you can showcase your products and services to people who are looking for what you offer.
Use descriptive names that contain your keywords for your pictures when saving them. (i.e., instead the name your camera automatically assigns).
Google determines which photo will be shown based on a number of factors, like how well the photo represents the services or products the business offers. There are significant SEO benefits to using images to build your online footprint as businesses with good images perform better in local search rankings.