14. The method of claim 11 , wherein determining an insertion score comprises: determining central tendency score from relevance scores of images that are to be displayed in the image display environment, each relevance score being a measure of relevance of a corresponding image to the search query.
11. The method of claim 10 , further comprising: determining an image intent score for the search query; and generating an image insertion request only when the image intent score exceeds an intent threshold.