70% helpful. It often requires very good lighting to pickup details that help accurate matching. It might improve accuracy to add in photo effects/filters like brightness/contrast/sharpness. If testing results give weak automated accuracy in application of effects/filters, then give user option to tweak attributes similar to what's provided in Google photo. It could be cool/helpful/interesting/informative to change search results on the fly while user adjust attributes.
It might improve accuracy to add in photo effects/filters like brightness/contrast/sharpness.