Magus said:
...the vast majority of tagging is inherently about the character's physical appearance. Isn't that why general tags exist at all? Tagging every trivial bit of what a character is wearing isn't the most important thing, but as long as the tags are correct I don't think it's possible to tag too much.
To better explain what evazion is referring to, let's imagine a Gawr Gura post was uploaded with the following general tags:
"1girl solo long_hair white_hair blue_hair streaked_hair two-tone_hair sidelocks blue_eyes sharp_teeth short_dress blue_dress long_sleeves pocket drawstring hooded_dress shark_hood animal_hood nail_polish blue_nails shark_tail tail shark_girl bare_legs shoes blue_footwear cross-laced_footwear"
This hypothetical post is well above the 10 tag minimum. However, ignoring "1girl solo", none of these 25 tags describe the post any further than her character tag. Is she happy, or maybe sad? What's she doing? Where is she? We can't tell anything aside from the fact she's wearing her first costume and that it's probably a full body image, both of which can be covered by simply tagging "gawr_gura_(1st_costume) full_body".
Far more valuable are tags like standing_on_one_leg, outdoors, from_side, sex, scared, arms_up, explosion and so on. These tags actually describe what is happening in the post, and they're often neglected in favor of dumping a copypasted list of "character specific" general tags. There's nothing wrong with tagging Gura's white hair and blue dress, but only tagging her appearance and not bothering to tag that she's excitedly clapping while at the races, or eating pizza at Taco Bell, or running away from a real shark, is essentially just one step short of not tagging the post at all.