This generally comes in the form of comments that are left behind on the images you post by people who click on a photo and like it. As a business owner (or as the person in charge of adding images to the Instagram account), you have to track this information on a regular basis.
If possible, it is a good idea to check the comments and feedback which is being left behind on a day to day basis. Doing this allows you to see which photos your visitors most appreciate, which ones are getting the most traffic and which ones are leaving the biggest impact on them, both positive and negative impact.
Because not every person is going to react to a particular image in the same manner, reading comments is just as important (if not more important) than looking at the likes for different images. Just because two people like the same picture or dislike the same image, it does not mean it is for the same reason. When you read the comments, you can learn more about what visitors have to say about the images you are posting and you can pick up more about what they feel when they see certain images.
This engagement and comment sharing also begins discussions about your product and your company. So reading the comments, the interaction between your followers and what they are most talking about in each image is a great way to learn about what they like and what they do not like about different images which are posted.
This gives you an advantage by allowing you to make changes as needed and properly modify your story on the image sharing site, and to add the images which are most interesting and which are most liked by the followers and visitors that are coming on to your page.