Matt Cutts from Google talks about content on your landing or home page in this short YouTube video.
In general the more content on the landing page the more that GoogleBot has to digest and index. That includes text, pictures plus captions, stuff the search engine robots can read. He suggests more content whenever possible, rather than less. However you do not want to have too much.
Remember than the landing page is generally the first page a visitor sees. And when coming off a search engine query, your task is to keep the promises you made in your title tag and meta description. In my estimation you must also use this page as a traffic cop, pointing out other enticing aspects of your Web site in general. You want your visitors to dig deeply into you and convert to what ever actions you wish them to, whether ordering, calling, emailing, etc.
Learn more about title tags and meta descriptions.