I think it was bad idea to name it as fist series because soon it will not be your first LOL
It is always nice to see more people taking pictures but speaking about technical issues, it looks like you made those pictures 10 years ago because now technology is way better
I suspect that you forgot to set lighting properly so your rendering uses default camera illumination
to make everything look better you should use some more advanced lighting setup which includes different light types.
Speaking about the content itself I think you did something wrong with that ballgag and expression in the last picture is pretty scary as if she got possesed by demon LOL
Thanks for the feedback. I have only been using daz for maybe a month now. So any tips are appreciated.