Nice efforts, not sure if the severe cropping is a personal choice, an attempt at minimizing a blemish in the composition, or just not composing in camera?
I'm not sure this works for me. Weird colors, artifacts, shiny skin and some very strange stuff in the background above her head that is super distracting.
When you say practice, what were you trying to do?
Granted, I don't do portraits, so take this for what it's worth which aint much.