How to optimize your images in WordPress
It is essential to have the “title” and “alt” tags specified for each one of the images you use in your posts. The search engines will then know what this image is supposed to represent. Typing the title and alt tags for each image you use, however, can be a time-consuming task. Instead, you can use the handy SEO Friendly Images plugin.
Once you install the plugin, go to Settings -> SEO Friendly Images in your WordPress admin area. On this page you can specify the ALT and TITLE tags for your images. The plugin gives you the option to use internal variables such as %title, %name and %category. With them you can set the ALT and TITLE tags of your images to the title of your post for example. The plugin does the rest. This saves you a lot of time and keeps your images SEO-friendly .