code: public com.google.api.ads.adwords.axis.v201809.cm.Image getMarketingImage() {
          return marketingImage;
      }
docs: Gets the marketingImage value for this GmailAd.
  
  @return marketingImage   * Marketing image. An image must first be created using the MediaService,
  and Image.mediaId must
  be populated when creating a {@link "GmailAd"}.Valid
  image types are GIF, JPEG, and PNG. The
  minimum size is 600x314 and the aspect ratio must
  be 600:314 (+-1%). For square marketing
  image, the minimum size is 300x300 and the aspect
  ratio must be 1:1 (+-1%). Either
  productVideos or marketingImage must be specified.
  <span class="constraint Selectable">This field can be selected using
  the value "GmailMarketingImage".</span>