People have found my website just by searching Google images. Any Path to your product and your web pages is a good thing. They can also tell search engines "the content here is good!". Following these simple rules while inserting images on your web page will let images do a lot of work for you. This is one tip of many to maximize your ranking on search engines
This may seem obvious but it is definitely true. People look at what interests them the most first. To stand out from the crowd, use your own images as much as possible. Take the time to create and compose your images so they convey an idea quickly and clearly. If you cannot create unique quality images, it pays to hire someone who can for you.
Naming your images using your keyword phrases help immensely. They are another way of telling search engines what this page's content is going to be about. They also tell searchers what they can expect to find related to it. Search engines figure that if a page contains an image called "fashion-diva-Donatella-purple-shoes-in-Cork-window.jpg", the page will about shoes, fashion, maybe even a bit about Donatella Versace and also be relevant to Cork City or Cork County. Web searchers typing in any of those things may find your website page because of that. Use hyphens to separate words (-) not underscores (_). Google sees hyphens as word separators and underscores as word joiners so lovely-image-name becomes lovely image name where lousy_image_name becomes lousyimagename.
The image alt tag gives a description of the image to display if the image is not available OR if a text reader is used (like for vision impaired people – images are not shown to them obviously!). But more importantly for the SEO and images it is used by search engines to find out what your image is about. So what should we put in the alt tag of an image? Try to write a description of less than 150 characters that tell the engine what the page content is about. Put your keyword phrases towards the beginning. Google and Bing webmaster tools will check every image they find on your website for the Alt tag and if it is not found they report this as an error so do use them!
Like the image alt tag, the image title tag also gives a description of the image to display if the image is not available OR if a text reader is used (like for vision impaired people). Some browsers use this as the default text instead of the Alt tag when someone hovers over the image. I usually use the same information in the alt tag as the title tag. Use the same rules in filling these out that you would for the image Alt tags.
Page load speeds are hugely affected by the number of images and there file size. (how many megabytes of data and bandwidth they consume. Slow loading pages get penalty points in search engines so take the time to resize your images for what they are going to be used for. Taking this in account you should also limit the number of images you use on any page to absolute minimum. One very good creative image is far more effective than three or four mediocre ones.