I was gonna say this earlier but forgot. For showing wounds on animals and other races besides the main four, for whom it wouldn't be reasonable to make "wounded" graphics, a wound overlay seems to me like a practical "good enough" option. Just a line, or perhaps like three images of progressively more lines, in blood red (or, preferably, inheriting their color from the creature's blood as defined in the raws). Ideally these wound overlays would be masked to the sprite so that the wounds don't also extend to the creature's surroundings, but if that's too much work on Toady's part then that's fine too.
The gems are just highlights. It should keep it's color
Oh, yeah then scrap it. It's fine if things that are meant to be circles look like circles.
I like most of the bone stuff, but neither of the new crowns look like crowns. Since it's meant to be recognizable, take inspiration from historical crowns, which have as their foundation a band that encircles the head, and then go up from there. The high fantasy design of "anything regal that goes on a head" only works if there's a head in it to reveal the situation.
Also, remember that earrings don't have to only be rings. If you're doing different ones per material, you can consider that for example, bone earrings would likely be of one or several bones hanging from the "ring" that goes through the ear.
Edit: Oh, and I agree that putting bases on figurines is weird. They're presumably supposed to be the sort of figurines that were common in history, not something like the plastic collectables that have been popular in recent decades, but consider that even those shelf ornaments rarely have bases.