# 1 is a super shot...she looks really relaxed and happy.
The lack of eye contact with us, in #2 spoils it for me, sorry.
#3 is ok, but I'd try to do something about the colour of her teeth...they look yellow on my screen.
The shadows under the little girls eyes in the last two are grabbing my attention, and whilst I understand they are "her" and not due to lighting, I'd try to lighten then a bit, if you can.
Good first attempt..........just the thought of studio works scares me stiff!!!