Watercolor is perfect for depicting a subject without a lot of details in the background. The center of interest is Gabrielle's smile looking at the mouvement of the water in the pail.
There is no horizon line, the blue of the water melts into the white of the paper. The photograph shows Gabrielle in a white t-shirt, a white hat with coloured motifs and a big rock in the back. Not revelent to add the rocks and details of prints in her hat, they only create distraction from the action.