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Thanks for the question. At this time there's no way to apply a coupon to only a specific image or set.
Since you said you'd like to see this, I am going to go ahead and convert this post in to an "Idea" instead of a question so that other sellers can +1 the idea or add their comments, which will help our product team gauge the level of interest in having this kind of functionality.
I hope that helps and kind regards,