You can use image formats like WebP or JPEG, which offer better compression without compromising quality. These formats will improve SEO by speeding up page loads.
To minimise file sizes without compromising image quality, make use of smart image compression techniques. Faster loading speeds will improve your SEO.
Write each image's alt text with a focus keywords & proper well descriptions. Alt text helps search engines understand the context of the image, that improves SEO.
Rename your image files using descriptive, keyword-rich filenames. This helps search engines understand the content of the image & improves its ranked for relevant queries.
Make sure the images you are using are mobile responsive. This helps user experience, responsive design can boost rankings on search engines.
Use schema markup for your photos to provide search engines more details. By doing this, your photos will show up in rich snippets, increasing visibility & click-through rates.
Make use of lazy loading WordPress plugin for pictures. This improves user experience & is preferred by search engines for faster web page loading.
In your Google webmaster tools, create an additional XML sitemap just for the images & submit it to search engines. By doing this, search engines will find & index your pictures more easily.
Use CDNs to distribute your photos to several servers located all over the world. This improves user experience, search engine ranking results & speeds up image loading times.