People tend to be more connected with human face photos than they do with object images. A/B test using photos with human faces and object images to see which one converts better for your website. Just be careful when using stock photos. Stock photos are too overused and notorious for their fakeness. Optimizing for compelling visual elements on a webpage generates up to 94% more views. Try to take real photos of real people if possible. If not, then prefer relatively less-used stock photos. You can do a reverse image search with TinyEye to see how many times the stock photo was used or simply drag and drop the image to the Google image search box.