Your second photo looks perfectly exposed.
The first photo was shot in lighting that would challenge any capture medium - what is it that gives you concern about it.
I like the skintone colour, and the shots seem well exposed. It seems like both of these shots were shot in shade, And although there slightly different conditions, I feel if I expose at 400 I end up contrasty, where as at 200 I end up with quite a lot of extra exposure though no change in less colour contrast.
The other two photos have scantily clad women in them. I hope you weren't expecting the film to make your models look like them!