Duplicates Feature in iPhoto Needs Ignore Option

In iPhoto, the duplicates feature for merging duplicates sometimes will incorrectly label different photos as duplicates.

For example, I do character illustrations. One image is a character looking surprised with eyes and mouth wide open while the other is ”duplicate” is the same character but with one eye winking and mouth mostly closed.

There is currently no option to ignore these as duplicates to the other. As more and more of these false duplicates pop up, the larger the list gets and the less efficient it becomes to use this feature.

It would be nice to have the option to ignore duplicate to clean up the list.