comment #2635031 is correct. Treating any one-off depiction as equally canon just makes these tags useless, since the alternate breast size in question is still not what you expect from a character.
I don't know how you did it, but only the example you gave of Aqua is one where I can see an actual relevant difference, the other two are pretty similar when you take the relevant context like angle and clothing into account (which you should). This isn't a case like Aqua's where she became a lot larger later on though. This is just using a random screenshot as an example, and it doesn't hold nearly the same weight.
ANON_TOKYO said in comment #2635058:
comment #2635031 is correct. Treating any one-off depiction as equally canon just makes these tags useless, since the alternate breast size in question is still not what you expect from a character.
I don't know how you did it, but only the example you gave of Aqua is one where I can see an actual relevant difference, the other two are pretty similar when you take the relevant context like angle and clothing into account (which you should). This isn't a case like Aqua's where she became a lot larger later on though. This is just using a random screenshot as an example, and it doesn't hold nearly the same weight.
Well then, should one-off official depictions be tagged then (as alternate)? It seems like it would be more consistent then.
EDIT:
With the other examples, I'll concede the Kaela one is not as big as I initially thought it was, it was more the HoloDori outfit which is not relevant to the discussion here.
IRyS' side view does not support it simply being a case of her leaning forward, however.
Updated by ReturnToZero
Hey so reading it back I realize my tone was more aggressive than I intended, so I do want to apologise for that- I genuinely am just curious about how cases like these are handled since I want to tag more consistently, I didn’t mean to use those examples as gotcha moments or anything like that.
ReturnToZero said in comment #2635092:
Hey so reading it back I realize my tone was more aggressive than I intended, so I do want to apologise for that- I genuinely am just curious about how cases like these are handled since I want to tag more consistently, I didn’t mean to use those examples as gotcha moments or anything like that.
As ANON TOKYO said, it's a case-by-case basis for each image you should generally go with the canon/most common depiction of the character as the base, otherwise it makes poisons the alternate_* tags and ends up making them completely useless if anything goes, you can play it loose and forego tagging alternate breast size (larger) if you consider the breasts are only *slightly* larger than canon, in this particular case her breasts are noticeably more prominent than in most official depictions and models (post #4724951, post #6813553, post #12043298, post #12276047).
Regarding to one-off official art, it should be tagged IMO (like post #5784906 where she has borderline huge breasts as opposed to her usual medium-to-large breasts). Tags in danbooru are visual in nature and meant to be searched, a good rule of thumb when tagging in general is asking yourself "would anyone expect this post to show up/not show up in the first page of results for [insert tag name]?"
Mexiguy said in comment #2635031:
As I said we go by the official canon design, you can't just arbitrarily decide that a character having larger breasts than her official design no longer counts as alternate breast size (larger) just because from a single (or a handful) of artworks from a third party (or in this case a single frame of an MV) depicts her with huge breasts, even if it's official art.
That's literally one of her models every that Hololive members have is their custome, so just shut up please
かずや伊藤 said in comment #2641952:
That's literally one of her models every that Hololive members have is their custome, so just shut up please
It's one model out of many. It's an outlier, not a trend. That's the point Mexiguy was making.
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