I love the attention to detail in the wrinkles, the neck and the thinner lips. Maybe some work on the sclera and the iris so they're not so white/clear could help a bit.
Guess it's hard to do sagging skin unless you could use a geoshell with a tiny bit of dforce and some very specific normal maps maybe. Perhaps that's why they've gone for the extremely sunken, almost skeletal look.
The vendor tends to use very heavy LIE make ups on all their characters, not sure if these designs suit the older model. Having seen a lot of their promo images, they go for the same poses/lighting set ups which (again) tend to work with a younger/glamour model and you can see the same posing here.
With some tweaking and different lighting, this could be a really great older character, I'm actually quite excited for the release as there aren't many high quality older ladies available.