Your framing / cropping is very suspect for both series.
First series:
Avoid having the shoulder towards the camera. As the dominant body feature, this causes the head to look small in comparison.
The shadows..... I might could be okay with the body shadows, but because the facial shadow begins under her nose, that shadow looks like a mustache.
Scenery is out of context with model in swimsuit IMO.
Second series:
With exception of #1, context is much more inline.
Harsh lighting that was not handled all that well IMO.
Nose breaks opposite cheekline in #2.
Nice profile in #3. Camera position is possibly a bit too high.
Overall not that bad, just a few things to remember / consider for the next outing.