As well as the common sense guidelines to optimising your site; using words in the text of your pages which are relevant to your product or service and matching them up with your meta tags (behind the scenes), there are lots of other little ways to help you climb the SEO ladder.
One of these is labelling your pictures effectively. When you upload a photo, diagram or other picture file to your website the visitor does not see the file name but the search engines do. Think about when you search for something on the internet and your results offer you 'images'. These are all there because of the way that the picture files are named.
So always make sure that the file name for any picture that you upload is also relevant to your site. If, for example, you are a small business in North Devon offering a wedding photography service and you want to upload an example of your work, make sure the file name for the photograph is not something like 'tom and penny 2013' as that will be irrelevant to your desired customers. A file name such as 'wedding photography north devon' will be far more effective in bringing exactly the right kind of traffic you want to your site.