30 is too young for milf, it's more big sister territory. if 40+ then I'm all for it but 30 just ruins the whole thing. especially if in daz 30's just gonna look 22 anyway, so make sure she separates by a generation from the young girls.
I assumed the latter 'black' meant 'black hair'. so that. and fair skin. winter is always colder than summer. blonde can work, but it needs the right cut and that can be tough to get. most daz blonde hairs will look like bimbo. (btw there's absolutely no way bimbo works for a dominant personality. bimbos are prey.)
big ass, biggish tits. although there's an argument for making strict characters skinny and dry for effect. skinny with small tits but big ass might work well too. huge udders make her look soft so that's a concern.
strict personalities should have constricted hair, and clothing, just like their personalities. tightly wound, uptight, keep those shirts buttoned all the way up. a tight bun is always good. if there's a ponytail it should be short. long ponytail brings softness which we don't want here.
don't make her evil, just strict and principled. otherwise it gets very flat and bland. strict gives much more range for more complex personality.