I love my sims realistic too, i don't know if you can tell haha. None of my cc is cartoony tbh. There's some great stuff out there that makes less detailed skins look more realistic as well.
So some cc tips from my side to generally make your sims more realistic would be: Adding to all the stuff you can get from Scarlett, I really like the lipsticks that include teeth - S-club and Pralinesims have some of those - or Bobur's teeth with any lips. You can also get a bunch of extra sliders which make you able to have more varied body types - there's a bunch of people who make them but I really like redheadsims' sliders - they also do great hairs for all ages (they convert a lot of the realistic hairs that are only made for teens-elders into toddler and children's hairs, as well as making their own hairs. I also really like their nails). Body hair is also quite transforming for male sims especially. My favourite eyes would probably be by Pralinesims (they do skins too though I don't find them very realistic and don't use them much)