In the first one, the dodging of the background to pure white is a bit too obvious to the trained eye, although it is certainly an engaging picture of a model with a lovely cheeky grin and a glint in her eye. Shows that she was engaging with you, which helps to get natural portraits.
The second one is probably the weakest of the 5 portraits you have posted. The angle and/or composition doesn’t seem quite right, and the expression is a little unsure. The hair light needed to be slightly more to the side :D