I am finding that picture ads in particular are not served very well for specific keywords. For example, a web page specifically relating to Madagascar gets served with holidays in Sicily! Any tips on how to get page specific ads served? Oh these ads have been running now for about 1 month
there is probably less inventory of image ads than regular old text ads, so the targeting wont be as good. I have found that in general, image ads don't do very well even if they are targeted because so many internet users have become 'banner-blind' - this is why Adsense text ads do so well..