I love the mother/daughter dynamic here. It's really interesting.
The thing that jumped out at me is the difference in exposure between the highlights and shadows. Notice how the eyes, especially the mom's left eye, are a little too dark? See how the left sides of the faces and bodies are so light that they've lost detail? This happens a lot when the sun is high in the sky (the few hours before and after noon). Try waiting until later in the day or putting the models in the shade. I think you'll get a more balanced exposure.
Anyhow, this is a great photo. Good capture of the models' personalities!