This is a tricky one, Adsense have very strict guidelines, however they DO allow images next to ads aslogn as they arn't there to trick the user into clicking the ad, for example if you had a text list and put a image which related to your site to the left (as if it was part of the list), this would eb against there TOS.
Try posting your site on the Adsense forums, people there will check for you.
Sean