2. The system of claim 1 , wherein the data processing apparatus instructions cause the data processing apparatus to perform operations comprising: determining an image intent score for the search query; and generating an image insertion request when the image intent score exceeds an intent threshold.
2. The system of claim 1 , wherein the data processing apparatus instructions cause the data processing apparatus to perform operations comprising: determining an image intent score for the search query; and generating an image insertion request when the image intent score exceeds an intent threshold. 5. The system of claim 2 , wherein determining dimensions of the image display environment comprises: determining a distribution score that is indicative of the distribution of quality scores of the images that are responsive to the search query; determining a product of the distribution score and the image intent score; and determining a number of rows of images to display in the image display environment from the product of the distribution score and the image intent score.