Tagging methodology for Kazusa (blue archive)

Start with WD1.4 Swinv2 at 0.25 confidence.

- Tag unique features
  - `halo` / `demon horns` / `low wings`
  - Remove when not present or out of view.  WD1.4 likes putting `halo` even on images where no halo is visible.
  - Kazusa: `halo` / `animal ears`
    - Pruned `extra ears` as it seems redundant.
- Tag outfit variants with a single master tag
  - Kazusa:
    - Uniform: `school uniform` / `black jacket`
      - Sometimes the jacket appears without anything else, which was not tagged `school uniform`
    - Non-canon costumes
      - Add `alternate costume`
  - Nudity (WD1.4 usually does this accurately)
    - `nude` / `completely nude`
- Prune eye colors
  - Keep tags which describe unusual eye features (`multicolored eyes`, `heterochromia`, `slit pupils`) as they can otherwise be too subtle and inconsistently drawn for the AI to learn
- Prune hair colors
  - This includes `two-toned hair`, `gradiant hair`, etc.  The AI learns all of these very consistently without the tags, likely because artists tend to draw them consistently
- Partially prune hair styles
  - Leave key style tags like `twintails`, `ponytail`, `short hair with long locks`.
  - Prune exceedingly common tags like `bangs` / `sidelocks` / `eyebrows visible through hair` / `hair between eyes`, etc.
  - Prune length, except for images which differ from the character's usual length
    - Add `alternate hairstyle` and/or `alternate hair length` for these
  - Kazusa: `short hair, colored inner hair` -- while I would usually prune these, they're really her only defining hairstyle traits
- Fixup hair ornaments
  - Prune generic `hair ornament` in favor of more specificity
    - `hairclip` / `black headband` / `hair flower` / `hair ribbon`, etc.
  - Consolidate tags that have color variants (`headband` >> `black headband`)
  - Kazusa: `hairclip`
- Consolidate outfits
  - Only tag an item when it is actually visible. If it is only barely visible along the edge of an image, keep in mind it may be cropped during bucketing.
  - Danbooru's wiki entry for a character often provides a good list of tags commonly used to describe a character's outfits.
  - Kazusa outfits:
    - School Uniform
      - `black choker`
      - `hooded jacket`
      - `black jacket`
      - `green sailor collar`
      - `pink neckerchief`
      - `miniskirt`
      - `pleated skirt`
      - `white skirt`
      - `black pantyhose`
      - `sneakers`
- Fixup sleeves
  - ie. `long sleeves` / `puffy long sleeves` / `detached sleeves`
  - You only need one, but pick one and be consistent. If sleeves aren't tagged properly the tends to add them inappropriately (such as when prompting for sleeveless outfits or nudity)
- Fixup collars
  - ie. `detached collar` / `collared shirt` / `choker` / etc.
  - Same deal as sleeves, they tend to appear when unwanted if not consistently tagged according to visibility in the training data.
- Fixup clothing state
  - ie. `open jacket` / `open shirt` / `partially undressed` / `off shoulder`
  - The tagger is generally pretty good at this.
- Tag expressions
  - WD1.4 rarely tags these, but doing them manually can help the AI reproduce a character's iconic expressions well.
  - Start by searching for images without one of these, and add them.
    - `open mouth`
    - `closed mouth`
    - `parted lips`
  - Add less common expressions
  - `smile` / `light smile` / `:d`
  - `wavy mouth` / `embarrassed`
  - `flustered` / `panicked` / `swirly eyes` / `@_@`
  - `surprised` / `o_o` / `wide-eyed`
  - `upset` / `annoyed` / `frustrated` / `v-shaped eyebrows`
  - `naughty face` / `seductive smile`
  - `smug` / `:3`
  - `eyes closed` / `one eye closed`
    - WD1.4 usually gets these for you.
- Tag camera angles/composition
  - `cowboy shot`
  - `upper body`
  - `full body`
  - `portrait`
  - `cropped torso` / `cropped legs`
  - `feet out of frame`
  - `from side` / `from above` / `from below` / `from behind`
- Tag iconic poses/actions
  - ie. `v` / `standing on one leg` 
  - Kazusa
    - `mouth hold`
    - `eating`
    - `macaroon`
- Flip through each image and use Hydrus's "related tags" feature to quickly identify important tags that might be missing.
  - This feature looks at other images with similar tags to provide suggestions.