1. A method, comprising: performing, by one or more computing devices: providing a user interface for specifying an image-based search query; receiving input via the user interface selecting an image for use as a search query; receiving input via the user interface making one or more modifications to the image selected for the search query; performing an image similarity search using the modified image as a search query for the image similarity search; and presenting one or more other images as a result of the image similarity search, wherein the one or more images are included in the result based on similarity to the modified image.