Alternating text for an image is known as an ALT tag. No matter the dimensions, priority or other characteristics of the image, it should be used. ALT tags, to put it simply, are a description of your image. What does your image actually represent, literally speaking?
Search engines use the ALT tag to crawl your image. If the image cannot be rendered, the image’s ALT tag is used instead. Screen-readers also use the ALT tag for users who have lost their sight.
For example, our ALT tag or descriptive text in this image might read:
ALT Text: Shoping Relavent Image
Also Read: Choose a right image alt tags
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Regarding Image SEO, we have a very popular (and lengthy) article. Covering you all the parts of Image Optimization in this article, How To Image Optimization for SEO discusses many different techniques for optimizing photos. If you are interested in learning more about Image SEO best practices, I suggest reading that post.