More features needs to be added to image search we need to make it advanced to cater to more people who work with images.
Here are some of the features i like:
ability to select aspect ratio of images.
ability to select images with options panaromic or portrait(this should be based on aspect ratio itself but can take the aspect ratio into account loosely)
ability to find images that are licensed with creative commons and can be used by people without acquiring any rights.
ability to search for black and white or colorful images.