After launching mobile versions of its AdWords and AdSense programs last September, the internet search giant is now adding visuals to these efforts. Google’s (NSDQ: GOOG) mobile image ads format can be described as shrunken versions of its standard banners, albeit sent to pages based on keyword targets. In another similarity with the main AdWords program, the mobile image ads are priced on a cost-per-click basis.

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For advertisers, Google claims that the image ads can boost clickthrough rates, while expanding its menu of services. The program will be available in about two dozen countries, including the U.S., the UK, Japan, China, India, Russia, France, Australia, Germany, Ireland, Italy, the Netherlands and Spain. More details on Google’s mobile blog.