20–39cm Dolls My 3D WIPs

impressive work, the sculpting looks great! the engineering might need a little work i am just listing from what i can see. The thing that caught my eye is that the neck socket on the first, second and last head looks too high up and may result in weird posing, like the back of the head should be extended down somewhat (like head number three ) or they might end up sitting with a raised chin sort of pose, or too far foreword when put on a neck?

with the rabbit i would be concerned about his legs staying in that pose instead of bending, maybe you have already accounted for this as this could be hidden inside the joints but (if you haven't already) i would recommend adding notches to lock the joints in the desired poses or at least the standing one!

the naga's(?) head also looks like he may only be able to move side to side and not tilt upward but if that's not a pose you care for him to take that's fine! The fact that his torso joint are rather angled also catches my eye, it's hard to say without a cutaway shot but i would check if all of them would actually contribute to his posing , if the ball sockets hidden in the cups of the joints aren't round and big enough they won't do much but they could be perfectly functional and i just can't tell from the provided images.

with ball joints i find only having them in hand or a ton experience would prevent any mishaps as gravity and elastic start to effect the dolls posing so don't despair if they don't end up quite like how you envisioned