When searching for chemical_structure agnes_tachyon_(umamusume), over 98% of the results will show her distinctive ear ornament which is stylized as a chemical structure. This is partly true, but it limits the search to the original intent of this tag - artwork depicting normal chemical structures, not just the little accessory on her ear.
>Suggestion: create a tag chemical_structure_ear_ornament and then accordingly replace the chemical structure tag with this qualifying tag
I decided to ask first for the reason that ear ornament exists without clarifying sub-tags, except for only one - heart ear ornament
So as not to create unnecessary work with removing the tag in case no one deems its existence necessary.