Thanks, I've chimed in on that thread, for what good that does.
I guess `crossed forelimbs` sort of works, but it's a bit awkward, and you wouldn't want to merge `crossed wings` into that, so I can see why they left it. It also implies race, so it's not without merit. Fur, skin, and coat are far more muddy terms, though, and feathers is almost entirely forgotten.
Hm, if that's how you want to define it, I think you would need to have both tags separated. `3d art` (as opposed to traditional or digital) is the parent tag, with `3d portrait` for character models and `3d landscape` for scenes. That muddies the purposage of `render` and non-art (screenshot/SFM ponies) in `3d`, though. If `render` becomes `3d art`, we would need `3d screencap` for games, poses and "makers". I think that's a superior system, but it would require retagging practically everything, and said uploaders would probably still consider those things "art"...