Image ads

image ads get readers' intention more than the text ads. they are more appealing than the text ads. by choosing image ads your blog's value increases, advertisers eagerly want to advertise on your site. then both text and image ads will compete in the same auction to display on your pages, and google automatically display the ad(s) that will be most effective for you on your site.
when you're creating a new ad unit, your ad type preference is set to text and image ads. Then, test the image ad option on a small subset of your pages for at least 2 weeks and track the progress using channels. by doing this you will get to know which ads are most appealing for clicks.