"Were these "realistic" figures done with Poser or D/S tools and availabe textures or all your own mesh work and texturing from scratch?

Those two are based on a weightmapped V3 with some scaling and custom made morphs and rigging made in ZBrush.

Textures are a heavily modified "Millenium Dollar Baby" for the face and the old, old MilGirlPT default texture for the body. (Converted to V3)

Most others are based on a weighmapped David hybrid as his default proportions are closer to "average" men and woman.