Facebook: https://www.facebook.com/AudioBlocks
Landing page: Unlimited Audio Downloads for $99/year
Placement: Desktop newsfeed
Critique: The image is colorful, engaging and relevant to the service being offered. Text above the image details who benefits from using this service. The promo offer is clearly displayed below the image. For added effect, the extremely large quantity of available files is also mentioned.
The fulfillment that the ad promises is a button at the right of the landing page. You also have the option of reading more about the service by scrolling down. You can browse samples before signing up, if you choose.