I know it will not be easy...
But sometimes a series of virtually identical photos are uploaded and linked to an airframe. Searcing an airframes shows these identical pictures. In my humble opinion multiple photots do not ad to the quality of the site.
But I have no idea how to avoid this, exept from asking photographers to limit their uploads to just one of two pictures,
Direct reason for this request is the Robinson helicopter N525MD, which has a series of about ten identical pictures. But I'm sure there will be many more airframes suffering from this.