Perhaps a detail that would sell it more, the hole in her ear from piercing it could be more stretched out. Perhaps the ear could also look older? Atleast caucasian people have their ears and nose grow all their life I heard. Not sure if its true for asian women. They supposedly (ofc always an exception to the rule..) get finer wrinkles cause they dont loose the fat in their face when they get older (and they have more of it)
Another thing I notice is that there are no vertical wrinkes on the bridge of the nose going up.
I figure wrinkles are the wear and tear of facial expressions on the skin. I think a frown comes along with that mouth expression, might be a good good idea to add the vertical wrinkles on the nose bridge between the eyebrows to indicate that.
Also, that big wrinkle on the chin looks a bit like scar tissue, perhaps
you could work the upper edge to make it look like sagging skin.
love the mouth area, Spot on I think!
Overall looks great! Also, I am sure that you might be working from reference, and the wrinkles are actually like that. Faces are different afterall! But thoseare my impressions of what generally happens.