Beautiful composition, beautiful model and happy colors. and you have created a nice mood with the lighting.
btw, u clicked this totally in natural lights or you have used externel source or further editing ?
Love it! Lighting is good, the mood is instantly transformed to the viewer. This was a happy, fun time for you two and she's really emoting well. The hair in her face is no problem as it just shows the natural state of the action, and her smile just completes the scene. Thumbs up!