those are some great shots! the city in the back ground and the stretching shadows of the figs look great. i like the first one the most. i really hope this thread turns into a photography of unpainted figures area!
I dig unpainted stuff as well, because (to me) the sculpt itself is 99% of the piece, & some paint schemes get in the way of viewing the form. Always respect the sculpt!
If the sculpt is detailed enough then a nice solid vinyl unpainted can make all the difference. the shadows from the nooks and crannies provide all the depth the figure needs. I'm also a sucker for those Mold-A-Rama figures. no paint just quick molded plastic. and simple amazing.
Some sculpts need paint and some don't. If you can see details without paint then I generally like it. Whether it''s painted or not...if it looks good then it looks good.