We have discussed in the past how placing images near the contextual ads in the Google AdSense program works well in increasing ones clicks on the ads. Which in turn increase ones revenue. Those past articles are named Images Vertically Aligned to AdSense Ads, Using Images To Increase Your Adsense and Image Ads Above AdSense Ads Increase CTR. But what is Yahoo! Publisher Networks' policy on the use of images near the contextual ads to increase visibility and CTR?
A DigitalPoint Forum thread has a response from Yahoo! on the question of placing images near the YPN ads.
A review of your URL NOT LIVE PAGE shows that the only possible issue with that page concerns the images placed next to the Yahoo! Publisher Network ads. These images must be contextually related to the content on the page as a whole. For more information about our policies, please visit the Terms and Conditions link, found at the bottom of most pages within your Publisher Network account.
And I quote again, "these images must be contextually related to the content on the page as a whole."
So you cannot place random images on the site, which make sense. The images most be related to the content and then you can place them near the contextual ads.
Forum discussion at DigitalPoint Forums.