Make the most of your image ALT attributes
Images don’t contribute much to SEO because search engines can’t ‘see’ pictures or analyse their content. But you can make the most of your on-site images by ensuring their ALT attibutes make sense.
Provided your images’ attributes are descriptive and accurate, search engines will find it a tiny bit easier to rate and classify your website correctly.
It always helps to have a suitable tool handy. This one checks your website images and tells you how clearly - or otherwise - they can be’ seen’ by Google and co: http://www.feedthebot.com/tools/alt/