To increase your website or blog traffic, post it in one place (e.g. to your blog or site), then work your social networking sites to build visibility and backlinks to where your content is posted. Facebook, Twitter, Digg and other news feeds are great tools to use that will significantly raise the profile of your pages. Search engines can only search what is actually in your website, and not what is in an image description. Try and stay away from image description. Instead you should put a text box below the actual image so the words can be searched for in a search engine.