My opinion for a new Antonia, off the top of my head, would be to use the original as a base and change the following things;

Make the lips part of the head UVs, additionally I don't think a lip material is really necessary. Masks are pretty universally used anyway.

Remodel the eyes so that they are concentric loops throughout without that weird cubic iris topology. The iris should be connected to the sclera with the cornea and cover as one separate piece. Makes texturing and morphing easier. It would be nice if the 2 eye parts (eyeball; sclera, iris, pupil/cover with cornea) are both complete watertight spheres. Also position the eyes so that they are aligned straight along the z axis rather than at an angled orientation as they are now, makes using match centers and animated orientations easier or more predictable.

Complete genitalia topology built in, the bits needn't be apparent just so long as all the topology is there. That is, model the gentalia in and morph flatten/smooth it out leaving a non-descript base but with all the necessary topology present for morphs. Would be best to perhaps uv in a present state, morph to non-descript, tuck the additional topology up into a non-descript genital crease for the base. And nope, HD morphs aren't as good nor practical as having the actually modeled topology available. HD is just icing for anyone who would extrapolate, being the ideal scenerio.

Avoid poles in the outer breasts and have the poles moved into the nipple area.

Try to avoid exotic rig choices. Weight maps and JCMs suffice with a "conventional" poser rig. I also have some opinions about body handle controllers (mostly about weights influence for those bits) but that's drifting even more than usual.

Also bear in mind that, probably, many people here who will be giving you pointers and suggestions, however well meaning and second hand informed, have never manually rigged a figure from scratch nor created a JCM in their life, regardless of how Poser lofty the demeanor. There's a difference between the knowledgable collector and the creator. Conversely the creator has a difficult time seeing the forest for the trees. Caveat in both directions.

What really makes anything Antonia unique is the license, and all that comes from that. It would be the figure's biggest advantage, comparably.

There's a ton of other things,  just personal opinion, and very specific about morphs and figure topology/UVs... but just woke up and need my coffee. Not to mention I've probably haunted your comments over the past few months to a sufficiently irritating degree :D