If you want to keep your reader on the page, or even attract new readers, you need to provide some eye-candy to keep them on the page. Plain text is such a turn-off when it comes to presenting anything, and it doesn’t matter how good or important the text is, unless it’s an academic text or novel. images help keep readers on the page and give readers a more pleasant and memorable experience than just plain text would.

Well tagged images will also increase your search engine ratings as well as bringing in visitors searching for images associate with your tags. Even If you are not using your own hosting or html to display images, simpluy giving them an appropriate name will help your ranking rise.