Let me count the ways….. There are two.
There are people who search for images and who may find your website based on an image search.
This works better for some products and services than others.
If you sell remodeling services or pet products or services or horse riding accessories or lessons the use of images will increase the number of people who find your website when performing an image search.
This article is part of a series about local SEO marketing. For access to all the articles in the series, click on the link in the prior sentence.
The image draws the eye and encourages the caption to be read. The caption should therefor ask a question or make a statement and that question or statement should be relevant to the topic of the article.
You should also put the image on the top right of the post, as for some reason that is where readers of the English language like to find them.