Hi!
•ent = it's not used as it was intended to. I suggest it will be replaced by "active rest" tag for rest job texts. Or stay and be used as that. It's for all those activities girls do that are not common enough to justify its own tag (like "reading" is).
•quest = these are for backgroundless sprite images. I'm specially using it for VisualNovel-like images in my pack. But only place where those are appearing atm is slave market.
•mood = mood is currently used is interactions and some job events - like, if the girl is beaten, and there is no "hurt" tag image, "profile"+"sad" is used. It's also needed for those "quest" VN pics to distinguish them. In combination with "sex" and "active" it can be used to look for rapeish like pics and so on. But mood is definitely not needed for most of the secondary categories, because there is usually not enough pics for that anyway. We need to talk about that in review.
•dildo = there are pics when the girl or a partner is holding a dildo in hand and it's unsure where it will be used

but it really may be unnecessary detail not worth having a tag
•active = it is a confusing tag. We were totally confused by that one too

It was supposed to be for pics where the girl is actively cooperating with the act.
•eat pussy = I say it is the same. I'm for removing it.
•weapon = we decided not to use this one
•simple bg = this one is for images that can be use anywhere (=simple colored or graphic background). No bg tag existed for backgroundless pics that were no VN sprites ("quest" tag) but that is not really needed so we can get rid of one of those ("quest or "no bg"). This simple bg tag need reconsideration too, because it's the most common case among pictures so it may be worth it for to be considered as default one with no tag. But there do exist pictures with backgrounds no suitable for pytfall world (too modern, alien, mecha...) so this needs to be considered too. But this primarily depends on discussion about another tag, "girlmeets" (=tag for girl wandering around the game world). And there's that system problem with using main tags only...
•autumn/winter - I suppose autumn is excessive detail, but winter is distinctive enough so it may stay.
•partner hidden - now this tag as one I consider important. It's for intimate interaction where MC is taking part in. We don't want to show Naruto having sex when MC is the one supposed to be there, and most importantly, there are usually plenty of pics with headless males or point of view pics for the packs for this tag. But maybe the name is confusing a bit, as the partner is clearly there and not hidden,
•beauty = beauty tag is for beauty school course right now. It doesn't mean a type of clothes like "fashionable". If we really need a outfits tags is another question... I tend to have a lot of pics under this tag, as I'm putting most of the clothes unusual for the character in question there.
•etiquette = same, etiquette is for school course, formal is a clothes tag.
•undress = is for girl dressing, undressing, but not putting on a strip show. So it's used with "profile" tag or "rest" tag usually. I've had some pictures like that in my packs, but it's hard to imagine any use for them in the game. So this one tag could go I suppose.
I think it may be good to talk (after we get to trait review) about every not totally obvious tag like this, and also talk about the all major game screen on how pictures should be called there, because only then it will be truly clear for everyone. And make a guide of what we agree upon.