the exposure is a hair off on these, but not enough for me to label it a real concern. just a little tweaking needed.
Ill try to expand on some other critique.
the angle #1 is shot at though.....not really doing anything for me. its shot from too high up. i would try that one again, but shoot from the stairs, not from the side.
off from the side+too high up+weird kinda tilt=reshoot on that one in my opinion.
#2 doesn't really do much for me either im afraid. you have a beautiful model, but you are not putting her at very good angles.
I want to say there is a bit of a focus issue in #2 as well. the top of her head and arms are sharp, but her legs and feet are...not so much.
I like the shadowing in the first shot, i just think the angle was poor. also, look at how beautiful her skin tones look in #1. you needed some flash in #2.
you COULD try just jacking your ISO up....but honestly, it doesn't matter how great your camera is at high ISO, its NOT as good as having a properly lit environment.
high ISO doesn't help with stopping any motion, doesn't help shadows, and doesn't help color tones due to mixed lighting from weird ambient light. in both of these pictures, you could easily have bounced a flash.
EDIT: your edits are much improved. especially on #2.