So for example, if you have a picture of a pen and you want to upload it onto your website, the robots don’t know that it’s a pen. What you would need to do is describe it with schema markup.
What is the brand name? Okay, it’s a ballpoint. Is it a black pen or a blue pen? Okay, it’s a black pen. Does it have a lot of ink in it? Is it newer? What is the pen on top of? These are the description terms that can be used when labeling and describing your images.
Other things to keep in mind are the location where the photo was taken. Location on images looks a lot like describing where and when the photo was taken. For example the outside of your storefront, might be the name your company. Use the common name or the local area wanting to rank on the photo name with the other keywords and upload it.