Yeah, it certainly took awhile to get here, don't know if it's a new artist at Eidos or an old one at Crystal Dynamics that just kept iterating but they've pretty much nailed it now, female anatomy perfection without pushing too far and her face is super pretty, and like you say she actually have muscles.I agree it would be a shame if they changed her again after how much time it needed to nail her design (and with this I include the IMO outdated old design).
I honestly have no issues with the old design, but for that to work at this point, for example in a spin-off, they would need to change the whole visual style more in line with some old super hero comics, and the men need to look similarly over the top, beefy and V-shaped backs. Dagger of Xian tried to use the old design with realism and I don't think it works.