Image ads are awesome. Do you know that Google said there ae the same number of people using the image netword as there were people using Adwords back in 2001. there is a huge opportunity. I recently interviewed a guy who has a really cool tool for the image network. Really makes thing easy. if you want to see the interview, go to http://theadwordsdominator.com/webinar1022
you have to study about google adwords learning center and its features to know image ads and text ads as well..