I've noticed that the glasses_on_head, goggles_on_head, and sunglasses_on_head are barely tagged, have no wiki pages and are not aliased/implicated to anything. Should we make these tags official and add a more general eyewear_on_head tag to the mix, or remove these tags?

The definitions for these *_on_head tags are self explanatory. They refer to an article of eyewear being placed somewhere above a character's eyes, like on top of their head. Examples:

post #50152 post #803078

I propose the following implications if these tags are accepted:

glasses_on_head -> glasses
glasses_on_head -> eyewear_on_head
goggles_on_head -> goggles
goggles_on_head -> eyewear_on_head
sunglasses_on_head -> goggles
sunglasses_on_head -> sunglasses_on_head

eyewear_on_head -> eyewear (just in case)

Nah, those subtags don't seem necessary. Search combos should work fine (glasses + on_head).

And eyewear_aside might be closer to the standard than eyewear_on_head.

I can't get accurate numbers here but using Danbooru's numbers for a moment:

glasses_on_head 1056
glasses_removed 1876

sunglasses_on_head 2603
sunglasses_removed 320

They also have *_around_neck tags.

Genjar said (edited):
Nah, those subtags don't seem necessary. Search combos should work fine (glasses + on_head).

And eyewear_aside might be closer to the standard than eyewear_on_head.

on_head isn't really tagged either so potentially viable later but not so now.

Wouldn't eyewear_on_head be closer to standard, considering tags like hand_on_head, cum_on_head and penis_on_head are in more common use?

Of course they are barely tagged. They're not the actual tags.

The tags are, as far as I know (since I've been about the only person using them), goggles_on_forehead, glasses_on_forehead and sunglasses_on_forehead (but I merge that one with glasses_on_forehead myself, so there's a lot less of it).

I know that. That's why I asked "Should we make these tags official...".

If the number of tags is a little excessive, changing glasses_on_head, goggles_on_head, and sunglasses_on_head to eyewear_on_head (or eyewear_on_forehead) and switching some of the implications to aliases is also an option. Less tags but also less precise.