I like the first one, not sure that the lighting would have worked as well as it has if you hadn't cropped as tightly...
What you've done here is to create some interesting shadows that define the shape of her face - which is exactly what you needed to do and the exact opposite of what most beginners try to do...
I feel that the keylight could have done with being a bit higher but it's worked fairly well as it is.
With the second one, the softbox is more or less OK but is maybe too close, producing softer lighting than you actually need for a young child with a perfect complexion. The shoot through umbrella to camera right has overlit the side of her face, making it fatter than it actually is. And the light on the background is over bright at the top, causing some loss of edge detail and some flare, and it has lit he background unevenly too.
But a very good start